Sleeve assembly and blood pump

Abstract

The utility model relates to a cannula assembly and a blood pump, the cannula assembly comprises a connecting pipe and a cannula, the connecting pipe is provided with a first pipe section and a second pipe section which are connected, the second pipe section is provided with a first metal surface, and the part, away from the first pipe section, of the first metal surface is provided with a first inclined surface; the sleeve comprises an elastic metal layer and a first flexible layer; the elastic metal layer comprises a main body section and a connecting section connected to one end of the main body section; the main body section and the first flexible layer are stacked in the radial direction of the sleeve; the connecting section is not covered by the first flexible layer and is provided with an exposed second metal surface, and the main body section is also provided with a second inclined surface adjacent to the second metal surface; wherein one of the second metal surface and the first metal surface can be annularly sleeved on the other one, so that the second metal surface is in fit connection with the first metal surface, and the second inclined surface is in fit connection with the first inclined surface. According to the casing pipe assembly, the stability of connection between the casing pipe and the connecting pipe can be improved, so that the risk that the connecting position of the casing pipe and the connecting pipe is loosened is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to a cannula assembly and a blood pump. Background Art

[0002] In order to reduce the mortality rate of cardiovascular diseases, a blood pump can be used to pump blood from the patient's aorta to the ventricle to assist the heart in working. The blood pump includes components such as a motor, an impeller, and a sleeve assembly. Among them, the sleeve assembly includes an outlet pipe, a sleeve, and an inlet pipe connected in sequence. In order to facilitate the connection between the sleeve and the outlet pipe, the sleeve and the outlet pipe are sometimes connected through an adapter pipe. These inlet pipes, outlet pipes, or adapter pipes can all be called connecting pipes. However, the connection between the sleeve of a traditional blood pump and these connecting pipes is easy to loosen, and then fall off, which makes the blood pump have certain safety hazards. Utility Model Content

[0003] Based on this, a cannula assembly and a blood pump are provided, which can improve the stability of the connection between the cannula and the connecting tube, so as to reduce the risk of loosening at the connection between the cannula and the connecting tube, and reduce the safety hazards of the blood pump.

[0004] In one aspect, the present application provides a casing assembly, the casing assembly comprising:

[0005] A connecting pipe, the connecting pipe having a first pipe section and a second pipe section connected to each other, the second pipe section being provided with a first metal surface, and a portion of the first metal surface away from the first pipe section being provided with a first inclined surface; and

[0006] A sleeve, the sleeve comprising an elastic metal layer and a first flexible layer; the elastic metal layer comprising a main body section and a connecting section connected to one end of the main body section; the main body section and the first flexible layer are stacked along the radial direction of the sleeve; the connecting section is not covered by the first flexible layer and has an exposed second metal surface, and the main body section is also provided with a second inclined surface adjacent to the second metal surface;

[0007] Among them, one of the second metal surface and the first metal surface can be looped over the other, so that the second metal surface is fitted and connected to the first metal surface, and the second inclined surface is fitted and connected to the first inclined surface.

[0008] In one embodiment, the first metal surface of the connecting pipe is located on the outer circumferential surface of the second pipe segment; the first flexible layer of the sleeve is arranged on the inner circumferential surface of the main segment of the elastic metal layer, and the first flexible layer does not cover the inner circumferential surface of the connecting segment of the elastic metal layer, so that the inner circumferential surface of the connecting segment forms the second metal surface, and the second inclined surface is provided on one end of the inner surface of the first flexible layer.

[0009] In one embodiment, the main body section of the elastic metal layer includes a main body sub-section and a diameter-reducing sub-section; the inner diameter of the main body sub-section is greater than the inner diameter of the connecting section; the inner diameter of the diameter-reducing sub-section gradually increases in a direction from the main body sub-section to the connecting section;

[0010] The first flexible layer includes a main body flexible portion and a variable diameter flexible portion, the main body flexible portion is arranged on the inner surface of the main body sub-segment, the variable diameter flexible portion is arranged on the inner surface of the variable diameter sub-segment and connected to the main body flexible portion; the inner surface of the variable diameter flexible portion forms the second inclined surface.

[0011] In one embodiment, the variable diameter flexible portion has a wall thickness in the radial direction of the sleeve, and the wall thickness gradually decreases in the direction from the main body flexible portion to the second metal surface, so that the inner surface of the variable diameter flexible portion forms the second inclined surface.

[0012] In one embodiment, the first inclined surface has a first length extending along the axial direction of the connecting pipe; the second inclined surface has a second length extending along the axial direction of the sleeve, and the second length is greater than the first length.

[0013] In one embodiment, the first bevel has a first length extending along the axial direction of the connecting tube, and the first length is 0.5 mm to 1.5 mm; and / or the first bevel and the second bevel have the same inclination angle, and the inclination angle ranges from 8° to 12°.

[0014] In one embodiment, the outer diameter of the second pipe segment is smaller than the outer diameter of the first pipe segment, so as to form the first metal surface and the first inclined surface on the outer peripheral wall of the second pipe segment, wherein:

[0015] The first inclined surface has a first length extending along the axial direction of the connecting pipe, the second pipe section has a third length extending along the axial direction of the connecting pipe, and the ratio of the first length to the third length is 0.15-0.23;

[0016] And / or, the sleeve assembly further includes a rubber ring, which is arranged on the first pipe section and adjacent to the end face of the sleeve, and the rubber ring bonds the connecting pipe and the sleeve.

[0017] In one embodiment, the sleeve further includes a second flexible layer, which is stacked with the elastic metal layer and the first flexible layer along the radial direction of the sleeve, and the second flexible layer is located on the side of the elastic metal layer facing away from the first flexible layer, and the second flexible layer covers the main section and the connecting section of the elastic metal layer.

[0018] In one embodiment, the connecting tube is an outlet tube, and the outlet tube is provided with a blood outlet;

[0019] Alternatively, the connecting tube is an inlet tube, and the inlet tube is provided with a blood inlet;

[0020] Alternatively, the connecting tube is a transfer tube, and the sleeve assembly further comprises an outlet tube, wherein the outlet tube is provided with a blood outlet and is connected to an end of the transfer tube away from the sleeve.

[0021] On the other hand, the present application provides a blood pump, comprising the cannula assembly as described above.

[0022] In one embodiment, the blood pump further includes a motor and an impeller, wherein the distal end of the motor is fixedly connected to the proximal end of the sleeve assembly, and the impeller is disposed in the sleeve assembly and connected to the rotating shaft of the motor.

[0023] The above-mentioned cannula assembly and blood pump, by providing a second metal surface not covered by the first flexible layer on the cannula, enable the cannula to be fitted and connected to the first metal surface of the connecting tube through the second metal surface when the cannula is fitted and connected to the connecting tube. Since both the first metal surface and the second metal surface are metal surfaces, both metal surfaces have the advantages of being not easy to deform and not easy to age. Therefore, compared with the surface fitting connection between the first metal surface and the first flexible layer of the cannula, the fitting connection between the first metal surface and the second metal surface is more secure and has a longer life, thereby making the connection between the cannula and the connecting tube not easy to deform and not easy to age, and the cannula and the connecting tube can remain stably nested together. Based on this, the adhesive bonding the second metal surface to the first metal surface is also not easy to deform and age, so that it can maintain good bonding strength for a long time, improve the connection stability between the connecting tube and the cannula, and reduce the risk of loosening at the connection.

[0024] In addition, the present application also provides a first bevel on the portion of the first metal surface of the connecting pipe away from the first pipe section, and provides a second bevel on the sleeve adjacent to the second metal surface. On the one hand, the guiding effect of the two bevels can be utilized to guide one of the sleeve and the connecting pipe to be sleeved on the other; on the other hand, relative to the plane, the first bevel and the second bevel can increase the contact and matching surface area of ​​the sleeve and the connecting pipe when they are sleeved, thereby increasing the firmness of the connection between the two. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the related technologies, the drawings required for use in the embodiments or the related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, drawings of other embodiments can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 This is a schematic structural diagram of an embodiment of a blood pump of the present application.

[0027] Figure 2 This is a schematic diagram of the structure of the casing assembly of the present application.

[0028] Figure 3 for Figure 2 Schematic diagram of the local enlarged structure at point I in the middle.

[0029] Figure 4 for Figure 2 Schematic diagram of the local enlarged structure at II in the middle.

[0030] Figure 5 for Figure 2 Schematic diagram of the structural breakdown of the middle casing assembly.

[0031] Figure 6 This is a schematic diagram of the assembly structure of a sleeve assembly according to another embodiment of the present application.

[0032] Figure 7 This is a schematic diagram of a connecting pipe used as an inlet pipe connected to a sleeve in one embodiment of a sleeve assembly of the present application.

[0033] Figure 8 This is a schematic diagram of another embodiment of the sleeve assembly of the present application in which a connecting pipe is connected to the sleeve as an outlet pipe.

[0034] Fig. 9 This is a schematic diagram of the connection between two connecting pipes and a sleeve in another embodiment of the sleeve assembly of the present application.

[0035] Fig.10 This is a schematic diagram of another embodiment of the sleeve assembly of the present application, in which the connecting pipe serves as a transfer pipe to connect the sleeve and the outlet pipe.

[0036] Fig.11 This is a schematic structural diagram of another embodiment of the sleeve assembly of the present application.

[0037] Fig.12 for Fig.11 A schematic diagram of the structural explosion of the bushing assembly is shown.

[0038] Description of reference numerals:

[0039] 1. blood pump; 10. motor; 20. impeller; 30. sleeve assembly; 31. blood inlet; 32. blood outlet; F. blood; 100. connecting pipe; 110. first pipe section; 120. second pipe section; 101. first metal surface; 102. first inclined surface; 200. sleeve; 210. elastic metal layer; 211. main body section; 211a. main body sub-section; 211b. variable diameter sub-section; 212. connecting section; 220. first flexible layer; 221. main body flexible part; 222. variable diameter flexible part; 230. second flexible layer; 201. second metal surface; 202. second inclined surface; 300. rubber ring; 400. outlet pipe. DETAILED DESCRIPTION

[0040] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0041] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element at the same time.

[0042] In the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0043] In the related art, the connection between the cannula and the connecting tube (such as the outlet tube, the transfer tube or the inlet tube) of the blood pump is easy to loosen and then fall off, which makes the blood pump have certain safety hazards. Therefore, the present application analyzes and studies the reasons why the connection between the cannula and the connecting tube falls off.

[0044] After research and analysis, it is found that connecting pipes such as outlet pipes, transfer pipes or inlet pipes are all made of metal materials; while the sleeve is an elastic tube that can adapt to the shape of biological tissues and deform. The inner and outer surfaces of this elastic tube are provided with a flexible layer, which is usually made of flexible materials; the sleeve and the connecting pipe are usually connected by a sleeve connection, that is, one of the sleeve and the connecting pipe is sleeved onto the other, so that the flexible layer of the sleeve contacts the metal surface of the connecting pipe, and adhesive bonding is provided at the contact position between the flexible layer and the metal surface. However, in this connection method, the flexible layer or adhesive at the bonding point is prone to aging, which reduces the strength of the connection between the flexible layer and the metal surface, and then causes the connection between the sleeve and the connecting pipe to loosen or even fall off.

[0045] In view of this, the present application proposes a cannula assembly and a blood pump to improve the stability of the connection between the cannula and the connecting tube, to reduce the risk of loosening at the connection between the cannula and the connecting tube, and to reduce the safety hazards of the blood pump. The blood pump is also commonly referred to as a ventricular assist device, which may specifically be a left ventricular assist device or a right left ventricular assist device. It should be noted that in the field of interventional medical devices, the end of the medical device that is closer to the operator is usually defined as the proximal end, and the end that is farther from the operator is defined as the distal end.

[0046] See also Figure 1 The blood pump 1 includes a motor 10, an impeller 20 and a sleeve assembly 30. The distal end of the motor 10 is fixedly connected to the proximal end of the sleeve assembly 30, and the impeller 20 is disposed in the sleeve assembly 30 and connected to the rotating shaft of the motor 10, so that the motor 10 can drive the impeller 20 to rotate.

[0047] Specifically, the cannula assembly 30 is provided with a blood inlet and a blood outlet 32. Taking the blood pump 1 used as a left ventricular assist device as an example, when the blood pump 1 is working, the motor 10 drives the impeller 20 to rotate, so that the blood in the left ventricle is sucked into the inside of the cannula assembly 30 from the blood inlet, and then continues to be driven by the impeller 20 and discharged from the blood outlet 32 ​​into the aorta, thereby assisting the left ventricle blood circulation.

[0048] See also Figures 2 to 5In one embodiment, the sleeve assembly 30 includes a connecting pipe 100 and a sleeve 200. The connecting pipe 100 has a first pipe section 110 and a second pipe section 120 connected to each other. The second pipe section 120 is provided with a first metal surface 101, and a portion of the first metal surface 101 away from the first pipe section 110 is provided with a first inclined surface 102. The sleeve 200 includes an elastic metal layer 210 and a first flexible layer 220. The elastic metal layer 210 includes a main body section 211 and a connecting section 212 connected to one end of the main body section 211; the first flexible layer 220 and the main body section 211 are stacked along the radial direction of the sleeve 200, and the connecting section 212 is not covered by the first flexible layer 220 and has an exposed second metal surface 201. The sleeve 200 is also provided with a second inclined surface 202 adjacent to the second metal surface 201. One of the second metal surface 201 and the first metal surface 101 can be looped over the other, so that the second metal surface 201 and the first metal surface 101 are fitted and connected, and the second inclined surface 202 and the first inclined surface 102 are fitted and connected.

[0049] Specifically, for the connecting tube 100, the portion of the first metal surface 101 away from the first tube section 110 is set as the first inclined surface 102, that is, the first inclined surface 102 also belongs to the metal surface. For the sleeve 200, the elastic metal layer 210 is a bendable and deformable spring tube. Compared with the surface of the main section 211 of the elastic metal layer 210 covered by the first flexible layer 220, the second metal surface 201 of the connecting section 212 of the elastic metal layer 210 is exposed, that is, the second metal surface 201 constitutes a part of the outer circumference or inner circumference of the sleeve 200, so that when the sleeve 200 and the connecting tube 100 are annularly arranged, the second metal surface 201 of the sleeve 200 can be connected with the first metal surface 101 of the connecting tube 10. The second metal surface 201 can be located on the outer circumference or inner circumference of the sleeve 200, and should be specifically designed according to the nesting method of the sleeve 200 and the connecting tube 100.

[0050] exist Figure 2 and Figure 5 In the illustrated embodiment, the sleeve 200 is sleeved on the connecting pipe 100. In this case, the first metal surface 101 and the first inclined surface 102 of the connecting pipe 100 are both arranged on the outer circumference of the second pipe section 120; the first flexible layer 220 of the sleeve 200 is arranged on the inner circumference of the main section 211 of the elastic metal layer 210, and the first flexible layer 220 does not cover the inner circumference of the connecting section 212 of the elastic metal layer 210, so that the second metal surface 201 of the sleeve 200 is formed on the inner circumference of the connecting section 212.

[0051] During assembly, adhesive may be provided on at least one of the first metal surface 101 and the second metal surface 201, and then the sleeve 200 is looped onto the connecting tube 100 from the first inclined surface 102 of the connecting tube 100 to the first metal surface 101, until the second metal surface 201 of the sleeve 200 is fitted and connected with the first metal surface 101 of the connecting tube 100, and the second inclined surface 202 of the sleeve 200 is fitted and connected with the first inclined surface 102 of the connecting tube 100, so that the sleeve 200 is looped onto the connecting tube 100. The first inclined surface 102 of the connecting tube 100 can guide the sleeve 200 to loop onto the connecting tube 100 along the first inclined surface 102, thereby reducing the difficulty of fitting and connecting the sleeve 200 and the connecting tube 100.

[0052] exist Fig.11 and Fig.12 In the illustrated embodiment, the connecting pipe 100 is sleeved on the sleeve 200. In this case, the first metal surface 101 and the first inclined surface 102 of the connecting pipe 100 are both arranged on the inner circumference of the second pipe section 120; the first flexible layer 220 of the sleeve 200 is arranged on the outer circumference of the main section 211 of the elastic metal layer 210, and the first flexible layer 220 does not cover the outer circumference of the connecting section 212 of the elastic metal layer 210, so that the second metal surface 201 of the sleeve 200 is formed on the outer circumference of the connecting section 212.

[0053] During assembly, adhesive can also be provided on at least one of the first metal surface 101 and the second metal surface 201, and then the sleeve 200 is inserted into the interior of the connecting tube 100 from the first inclined surface 102 of the connecting tube 100 to the first metal surface 101, until the second metal surface 201 of the sleeve 200 is fitted and connected with the first metal surface 101 of the connecting tube 100, and the second inclined surface 202 of the sleeve 200 is fitted and connected with the first inclined surface 102 of the connecting tube 100, so that the connecting tube 100 is looped over the sleeve 200. The first inclined surface 102 of the connecting tube 100 can guide the sleeve 200 to be inserted into the interior of the connecting tube 100 along the first inclined surface 102, reducing the difficulty of fitting the sleeve 200 and the connecting tube 100.

[0054] It can be seen that by providing the second metal surface 202 not covered by the first flexible layer 220 on the sleeve 200, when the sleeve 200 is fitted and connected with the connecting tube 100, the sleeve 200 can be fitted and connected with the first metal surface 101 of the connecting tube 100 through the second metal surface 202. Since the first metal surface 101 and the second metal surface 201 are both metal surfaces, both metal surfaces have the advantages of being difficult to deform and age. Therefore, compared with the surface fitting connection between the first metal surface 101 and the first flexible layer 220 of the sleeve 200, the fitting connection between the first metal surface 101 and the second metal surface 201 is more firm and has a longer service life, thereby making the connection between the sleeve 200 and the connecting tube 100 not easy to deform or age, and the sleeve 200 and the connecting tube 100 can remain stably nested together. Based on this, the adhesive bonding the second metal surface 201 and the first metal surface 101 is not easy to deform and age, so that it can maintain good bonding strength for a long time, improve the connection stability between the connecting pipe 100 and the sleeve 200, and reduce the risk of loosening at the connection.

[0055] In addition, the present application also provides a first bevel 102 on the portion of the first metal surface 101 of the connecting pipe 100 away from the first pipe section 110, and provides a second bevel 202 on the sleeve 200 adjacent to the second metal surface 201. On the one hand, the guiding effect of these two bevels can be utilized to guide one of the sleeve 200 and the connecting pipe 100 to be sleeved on the other; on the other hand, relative to the plane, the first bevel 102 and the second bevel 202 can increase the contact and matching surface area of ​​the sleeve 200 and the connecting pipe 100 when they are sleeved, thereby increasing the firmness of the connection between the two.

[0056] See also Figure 2 , Figure 4 and Figure 5 In one embodiment, the first metal surface 101 of the connecting pipe 100 is located on the outer circumference of the second pipe section 111; the first flexible layer 220 of the sleeve 200 is arranged on the inner circumference of the main section 211 of the elastic metal layer 210, and the first flexible layer 220 does not cover the inner circumference of the connecting section 212 of the elastic metal layer 210, so that the inner circumference of the connecting section 212 forms the second metal surface 201, and a second inclined surface 202 is provided at one end of the inner circumference of the first flexible layer 220. In other words, the second inclined surface 202 is not a metal surface, but a surface formed by the flexible material of the first flexible layer 220.

[0057] Specifically, the second inclined surface 202 can make the first flexible layer 220 smoothly transition to the second metal surface 201, so as to gradually eliminate the radial thickness difference from the first flexible layer 220 to the second metal surface 201. The first flexible layer 220 has stronger ductility during hot melting and is more easily adhered and fixed to the elastic metal layer 210. In addition, the second inclined surface 202 can be fitted with the first inclined surface 102 to guide the sleeve 200 and the connecting pipe 100 to be sleeved together. In addition, after the second bevel 202 and the first bevel 102 are fitted and connected, the second bevel 202 is equivalent to being clamped by the first bevel 102 of the connecting tube 100 and the elastic metal layer 210 of the sleeve 200, that is, a part of the first flexible layer 220 (i.e., the second bevel 202) is clamped by the first bevel 102 and the elastic metal layer 210, so that the connection between the first flexible layer 220 and the elastic metal layer 210 is more stable, and the first flexible layer 220 is not easy to separate from the elastic metal layer 210 and cause the problem of delamination and detachment.

[0058] See also Figure 2 , Figure 3 and Figure 5 In one embodiment, the sleeve 200 further includes a second flexible layer 230, which is stacked with the elastic metal layer 210 and the first flexible layer 220 along the radial direction of the sleeve 200, and the second flexible layer 230 is located on the side of the elastic metal layer 210 that is opposite to the first flexible layer 220, and the second flexible layer 230 covers the main section 211 and the connecting section 212 of the elastic metal layer 210. In other words, the first flexible layer 220 and the second flexible layer 230 are respectively located on the inner and outer sides of the elastic metal layer 210, and are stacked and connected together. If the first flexible layer 220 is disposed on the inner side of the elastic metal layer 210, the second flexible layer 230 is disposed on the outer side of the elastic metal layer 210; conversely, if the first flexible layer 220 is disposed on the outer side of the elastic metal layer 210, the second flexible layer 230 is disposed on the inner side of the elastic metal layer 210.

[0059] Specifically, the first flexible layer 220 is disposed on the inner side of the elastic metal layer 210 and covers the inner surface of the main section 211 of the elastic metal layer 210, but does not cover the inner surface of the connecting section 212 of the elastic metal layer 210; the second flexible layer 230 is disposed on the outer side of the elastic metal layer 210 and covers the outer surfaces of the main section 211 and the connecting section 212 of the elastic metal layer 210. Thus, the main part of the sleeve 200 corresponding to the main section 211 is a three-layer structure consisting of the first flexible layer 220, the elastic metal layer 210, and the second flexible layer 230; and the end of the sleeve 200 corresponding to the connecting section 212 is a two-layer structure consisting of the elastic metal layer 210 and the second flexible layer 230.

[0060] The first flexible layer 220 and the second flexible layer 230 can be connected to the elastic metal layer 210 by hot-melt process. The material of the first flexible layer 220 includes but is not limited to TPU (Thermoplastic polyurethanes), TPE (Thermoplastic elastomer), etc. The material of the first flexible layer 220 and the material of the second flexible layer 230 can be the same or different, which is not limited here.

[0061] In the above embodiment, since the first flexible layer 220 and the second flexible layer 230 respectively form a covering and sealing effect on the inner side and the outer side of the elastic metal layer 210, when the liquid flows through the sleeve 200, the liquid is not easy to leak from the elastic metal layer 210. Through this structural setting, the sleeve 200 can use the elastic metal layer 210 to maintain good support performance and bending performance, so as to facilitate the sleeve assembly 30 to pass through the patient's body without damaging the vascular tissue. At the same time, the setting of the first flexible layer 220 and the second flexible layer 230 reduces the risk of leakage when the liquid flows through the sleeve 200. When the sleeve assembly 30 is applied to the blood pump 1 (see Figure 1 As shown in the figure, the sleeve assembly 30 is used to construct a blood circulation channel, and at this time, the aforementioned liquid can be understood as blood.

[0062] Combination Figure 5 As shown, since the main body portion of the corresponding main section 211 of the sleeve 200 is a three-layer structure consisting of the first flexible layer 220, the elastic metal layer 210, and the second flexible layer 230; and the end portion of the corresponding connecting section 212 of the sleeve 200 is a two-layer structure consisting of the elastic metal layer 210 and the second flexible layer 230, the end portion of the sleeve 200 will obtain a larger inner diameter due to the absence of the first flexible layer 220. In this way, while keeping the overall size of the elastic metal layer 210 unchanged, the inner diameter of the end portion of the sleeve 200 for sleeve connection with the connecting pipe 100 (i.e., the diameter of the second metal surface 201) is larger, which can facilitate sleeve connection of the sleeve 200 to the connecting pipe 100.

[0063] like Figure 4 and Figure 5As shown, further, the main body section 211 of the elastic metal layer 210 includes a main body sub-segment 211a, and a diameter-reducing sub-segment 211b connecting the main body sub-segment 211a and the connecting section 212, the inner diameter of the main body sub-segment 211a is greater than the inner diameter of the connecting section 212; the diameter of the diameter-reducing sub-segment 211b gradually increases along the direction from the main body sub-segment 211a to the connecting section 212. The first flexible layer 220 includes a main body flexible portion 221 and a diameter-reducing flexible portion 222, the main body flexible portion 221 is arranged on the inner surface of the main body section 211; the diameter-reducing flexible portion 222 is arranged on the inner surface of the diameter-reducing sub-segment 211b and connected to the main body flexible portion 221. The inner surface of the diameter-reducing flexible portion 222 forms a second inclined surface 202.

[0064] like Figure 4 and Figure 5 As shown, in some embodiments, the variable diameter flexible portion 222 of the first flexible layer 220 has a wall thickness in the radial direction of the sleeve 200, and the wall thickness gradually decreases in the direction from the main body flexible portion 221 to the second metal surface 201, so that the inner surface of the variable diameter flexible portion 222 forms a second inclined surface 202.

[0065] like Figure 2 and Figure 5 As shown, in some embodiments, the first inclined surface 102 has a first length L extending along the axial direction of the connecting tube 100. 1 The second inclined surface 202 has a second length L extending along the axial direction of the sleeve 200. 2 , L 2 >L 1 With this structural setting, the second inclined surface 202 can be used to have a longer axial extension length relative to the first inclined surface 102, so that after the first inclined surface 102 and the second inclined surface 202 are bonded, a portion of the second inclined surface 202 still extends in a direction away from the connecting tube 100, so that the diameter difference between the two ends of the reducing sub-segment 211b of the elastic metal layer 210 is relatively large, so that while maintaining the appropriate diameter of the main body section 211, the reducing sub-segment 211b can be used to connect the connecting section 212 with a larger diameter, so that the aperture of the sleeve portion enclosed by the second metal surface 201 formed by the inner surface of the connecting section 212 is large enough to be sleeved and fixed with the first metal surface 101 of the connecting tube 100.

[0066] like Figure 2 and Figure 5As shown, in some embodiments, the outer diameter of the second pipe section 120 of the connecting pipe 100 is smaller than the outer diameter of the first pipe section 110 thereof. The first metal surface 101 and the first inclined surface 102 are both formed on the outer circumferential surface of the second pipe section 120. When the connecting pipe 100 is connected to the sleeve 200, the outer surface of the second flexible layer 230 is flush with or smoothly transitions to the outer circumferential surface of the second pipe section 120. The smooth transition here means that there is no obvious protrusion at the position where the outer circumferential surfaces of the second flexible layer 230 and the second pipe section 120 are connected to each other, so that the overall surface of the sleeve assembly 30 is smooth and rounded, so as to improve the overall appearance and reduce the probability of protrusions and wear at the docking position.

[0067] In some embodiments, the second pipe segment 120 has a third length L extending along the axial direction of the connecting pipe 100. 3 , L 1 With L 3 The ratio is 0.15≤L 1 / L 3 ≤0.23, so that the extension length of the first bevel 102 along the axial direction of the connecting pipe 100 is appropriately proportional to the second pipe section 120, so that the first bevel 102 can guide the sleeve 200 to be sleeved with the connecting pipe 100. Since the axial overlap between the first metal surface 101 and the second metal surface 201 is the connection portion between the two, the axial length of the overlapping portion between the two is the axial bonding length of the two. 1 / L 3 ≤0.23, so that the axial bonding length between the first metal surface 101 and the second metal surface 201 is appropriate, avoiding the bonding length being too long which is not conducive to the uniformity of the glue used to bond the two, resulting in poor bonding effect, and also avoiding the bonding length being too short which leads to insufficient amount of glue that can be applied, resulting in poor bonding effect.

[0068] The first length L 1 The first bevel 102 has an axial length of 0.5 mm to 1.5 mm, which makes the axial length of the first bevel 102 suitable, which not only meets the assembly guide requirements of the connecting pipe 100 and the sleeve 200, but also avoids the axial length of the first bevel 102 being too long and difficult to control the processing accuracy. 1 It can be 0.5mm, 0.7mm, 0.8mm, 1.0mm, 1.2mm, 1.4mm or 1.5mm, and is not limited here.

[0069] like Figure 2 and Figure 4As shown, in some embodiments, the first inclined surface 102 and the second inclined surface 202 have the same inclination angle A, and the value range of A is 8° to 12°. The inclination angle A can be, but is not limited to, 8°, 9°, 10°, 11°, 12°, etc. Through this structural setting, the fit between the first inclined surface 102 and the second inclined surface 202 is taken into account to enhance the bonding stability between the two, and the reducer section 211b corresponding to the second inclined surface 202 presents a suitable taper, so that the overall size of the sleeve 200 is coordinated.

[0070] like Figure 6 As shown, the sleeve assembly 30 further includes a rubber ring 300, which is disposed on the first pipe section 110 and is adjacent to the end face of the sleeve 200. The rubber ring 300 bonds the connecting pipe 100 and the sleeve 200. In this embodiment, the rubber ring 300 is connected to the end face of the sleeve 200, so that the rubber ring 300 can realize the connection between the sleeve 200 and the first pipe section 110, thereby enhancing the connection stability between the sleeve 200 and the connecting pipe 100.

[0071] It should be noted that, in the embodiment of the present application, the connecting pipe 100 may be any metal pipe having a first metal surface 101 connected to the sleeve 200 .

[0072] Combination Figures 2 to 4 and Figure 7 In some embodiments, the connecting tube 100 is an inlet tube provided with a blood inlet 31. In this case, a first metal surface 101 and a first inclined surface 102 are provided at the proximal end of the connecting tube 100; and a second metal surface 201 and a second inclined surface 202 are provided at the distal end of the sleeve 200, so that the distal end of the sleeve 200 and the proximal end of the connecting tube 100 are closely connected. When the blood pump 1 is working, blood F enters the connecting tube 100 from the blood inlet 31 of the connecting tube 100, and flows along the sleeve 200 to its distal end and is discharged.

[0073] Combination Figures 2 to 4 and Figure 8 In other embodiments, the connecting tube 100 is a transfer tube, and the sleeve assembly 30 further includes an outlet tube 400; the outlet tube 400 is provided with a blood outlet 32. In this case, the distal end of the connecting tube 100 is provided with a first metal surface 101 and a first inclined surface 102; and the proximal end of the sleeve 200 is provided with a second metal surface 201 and a second inclined surface 202, so that the proximal end of the sleeve 200 and the distal end of the connecting tube 100 are fitted and connected. The outlet tube 400 is connected to the end of the connecting tube 100 away from the sleeve 200 (i.e., the proximal end of the connecting tube 100). When the blood pump 1 is working, the blood F flows along the sleeve 200 to the connecting tube 100 and the outlet tube 400 in sequence, and finally discharged from the outlet tube 400.

[0074] It is worth mentioning that, since the inner cavity of the outlet pipe 400 is used to accommodate the impeller, the inner diameter of the outlet pipe 400 is designed to be slightly larger than the inner diameter of the traditional sleeve, that is, the inner diameter of the traditional sleeve is slightly smaller than the inner diameter of the outlet pipe 400, so that the difference between the inner diameter of the traditional sleeve and the outer diameter of the outlet pipe 400 at the first metal surface 101 (that is, the pipe diameter deviation) is large, making it difficult for the traditional sleeve to be directly sleeved onto the outlet pipe 400, so it needs to be connected through a transfer tube. In the present application, since the main part of the corresponding main section 211 of the sleeve 200 is a three-layer structure composed of the first flexible layer 220, the elastic metal layer 210, and the second flexible layer 230; and the end of the corresponding connecting section 212 of the sleeve 200 is a two-layer structure composed of the elastic metal layer 210 and the second flexible layer 230, the first inner diameter D of the end of the sleeve 200 is 1 (ie, the inner diameter of the second metal surface 201), which is larger than the second inner diameter D of the main body of the sleeve 200. 2 (ie, the inner diameter of the first flexible layer 220), that is, D 1 >D 2 , the second inner diameter D 2 The inner diameter of the traditional casing is comparable. 1 >D 2 , thereby reducing the first inner diameter D of the sleeve 200 1 The diameter deviation of the outer diameter of the outlet pipe 400 at the first metal surface 101 allows the second metal surface 201 of the sleeve 200 to be easily sleeved onto the first metal surface 101 of the outlet pipe 400, thereby eliminating the need for a transfer tube, thereby achieving the effect of omitting the transfer tube, reducing the number of pipes and simplifying the pipe connection process.

[0075] Combination Figures 2 to 4 and Fig. 9 In view of the above situation, in some other embodiments, the connecting tube 100 is an outlet tube provided with a blood outlet 32, and is directly connected to the sleeve 200. In this case, a first metal surface 101 and a first inclined surface 102 are provided at the distal end of the connecting tube 100; and a second metal surface 201 and a second inclined surface 202 are provided at the proximal end of the sleeve 200, so that the proximal end of the sleeve 200 and the distal end of the connecting tube 100 are closely connected. When the blood pump 1 is working, the blood F flows along the sleeve 200 to the connecting tube 100, and is discharged from the blood outlet 32 ​​of the connecting tube 100.

[0076] Combination Figures 2 to 4 and Fig.10In some embodiments, there are two connecting tubes 100, one of which is an inlet tube provided with a blood inlet 31; the other connecting tube 100 is an outlet tube provided with a blood outlet 32. In this case, the distal end and the proximal end of the sleeve 200 are both provided with a second metal surface 201 and a second inclined surface 202, the connecting tube 100 provided with the blood inlet 31 is fitted and connected with the distal end of the sleeve 200, and the connecting tube 100 provided with the blood outlet 32 ​​is fitted and connected with the proximal end of the sleeve 200. When the blood pump 1 is working, the blood F enters from the connecting tube 100 with the blood inlet 31, flows along the sleeve 200 to the connecting tube 100 with the blood outlet 32, and finally is discharged from the blood outlet 32.

[0077] Regardless of whether the connecting pipe 100 is an inlet pipe or an outlet pipe, or a transfer pipe, as long as a corresponding first metal surface 101 for sleeve-engaging with the second metal surface 201 of the sleeve 200 is provided, the second metal surface 201 and the first metal surface 101 can be fitted together to achieve a stable connection between them, thus avoiding the aging problem when the flexible layer of the sleeve 200 is bonded to the metal surface in the traditional technical solution.

[0078] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0079] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the inventive concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A casing assembly, characterized in that: The sleeve assembly comprises: A connecting pipe, the connecting pipe having a first pipe section and a second pipe section connected to each other, the second pipe section being provided with a first metal surface, and a portion of the first metal surface away from the first pipe section being provided with a first inclined surface; and A sleeve, the sleeve comprising an elastic metal layer and a first flexible layer; the elastic metal layer comprising a main body section and a connecting section connected to one end of the main body section; the main body section and the first flexible layer are stacked along the radial direction of the sleeve; the connecting section is not covered by the first flexible layer and has an exposed second metal surface, and the sleeve is further provided with a second inclined surface adjacent to the second metal surface; Among them, one of the second metal surface and the first metal surface can be looped over the other, so that the second metal surface is fitted and connected to the first metal surface, and the second inclined surface is fitted and connected to the first inclined surface.

2. The bushing assembly according to claim 1, characterized in that The first metal surface of the connecting pipe is located on the outer circumferential surface of the second pipe segment; the first flexible layer of the sleeve is arranged on the inner circumferential surface of the main segment of the elastic metal layer, and the first flexible layer does not cover the inner circumferential surface of the connecting segment of the elastic metal layer, so that the inner circumferential surface of the connecting segment forms the second metal surface, and the second inclined surface is provided at one end of the inner surface of the first flexible layer.

3. The bushing assembly according to claim 2, characterized in that The main body section of the elastic metal layer includes a main body sub-section and a diameter-reducing sub-section connecting the main body sub-section and the connecting section; the inner diameter of the main body sub-section is larger than the inner diameter of the connecting section; the inner diameter of the diameter-reducing sub-section gradually increases in a direction from the main body sub-section to the connecting section; The first flexible layer includes a main body flexible portion and a variable diameter flexible portion, the main body flexible portion is arranged on the inner surface of the main body sub-segment, the variable diameter flexible portion is arranged on the inner surface of the variable diameter sub-segment and connected to the main body flexible portion; the inner surface of the variable diameter flexible portion forms the second inclined surface.

4. The bushing assembly according to claim 3, characterized in that The variable-diameter flexible portion has a wall thickness in the radial direction of the sleeve, and the wall thickness gradually decreases in the direction from the main body flexible portion to the second metal surface, so that the inner surface of the variable-diameter flexible portion forms the second inclined surface.

5. The bushing assembly according to any one of claims 1 to 4, characterized in that: The first inclined surface has a first length extending along the axial direction of the connecting pipe; the second inclined surface has a second length extending along the axial direction of the sleeve, and the second length is greater than the first length.

6. The bushing assembly according to any one of claims 1 to 4, characterized in that: The first inclined surface has a first length extending along the axial direction of the connecting tube, and the first length is 0.5 mm to 1.5 mm; and / or the first inclined surface and the second inclined surface have the same inclination angle, and the inclination angle ranges from 8° to 12°.

7. The bushing assembly according to any one of claims 1 to 4, characterized in that: The outer diameter of the second pipe segment is smaller than the outer diameter of the first pipe segment, so as to form the first metal surface and the first inclined surface on the outer peripheral wall of the second pipe segment, wherein: The first inclined surface has a first length extending along the axial direction of the connecting pipe, the second pipe section has a third length extending along the axial direction of the connecting pipe, and the ratio of the first length to the third length is 0.15-0.23; And / or, the sleeve assembly further includes a rubber ring, which is arranged on the first pipe section and adjacent to the end face of the sleeve, and the rubber ring bonds the connecting pipe and the sleeve.

8. The bushing assembly according to any one of claims 1 to 4, characterized in that: The sleeve also includes a second flexible layer, which is stacked with the elastic metal layer and the first flexible layer along the radial direction of the sleeve, and the second flexible layer is located on the side of the elastic metal layer facing away from the first flexible layer, and the second flexible layer covers the main section and the connecting section of the elastic metal layer.

9. The bushing assembly according to any one of claims 1 to 4, characterized in that: The connecting tube is an outlet tube, and the outlet tube is provided with a blood outlet; Alternatively, the connecting tube is an inlet tube, and the inlet tube is provided with a blood inlet; Alternatively, the connecting tube is a transfer tube, and the sleeve assembly further comprises an outlet tube, wherein the outlet tube is provided with a blood outlet and is connected to an end of the transfer tube away from the sleeve.

10. A blood pump, characterized in that: It comprises a motor, an impeller, and a sleeve assembly as described in any one of claims 1 to 9; wherein the distal end of the motor is fixedly connected to the proximal end of the sleeve assembly, and the impeller is arranged in the sleeve assembly and connected to the rotating shaft of the motor.

Images