An outlet connection for a blood pump and a blood pump assembly

Abstract

The application provides a blood pump outlet connecting structure and a blood pump assembly. The connecting structure comprises: an artificial blood vessel, a front end of the artificial blood vessel being sleeved on an outer periphery of a blood pump outlet pipe, and a limiting ring being arranged in an end portion of the front end of the artificial blood vessel; a reinforcing sleeve pipe, the reinforcing sleeve pipe being sleeved on an outer periphery of the artificial blood vessel; and a locking ring, the locking ring being used for fastening the front end of the artificial blood vessel, the front end of the reinforcing sleeve pipe and the outlet pipe; wherein the limiting ring is limited to an outside of the reinforcing sleeve pipe, the front end of the limiting ring and the reinforcing sleeve pipe abut in an axial direction of the reinforcing sleeve pipe; or an accommodation groove is arranged in an end portion of the front end of the reinforcing sleeve pipe, the limiting ring is locked in the accommodation groove, and the limiting ring and the accommodation groove abut in the axial direction of the reinforcing sleeve pipe and in a radial direction. The connecting structure is compact in the whole, convenient and fast to operate, and a doctor can quickly connect the connecting structure with the blood pump outlet pipe, so that the operation time is effectively saved, and the problem that the artificial blood vessel is sleeved too much or too little does not occur.

Description

Technical Field

[0001] This application relates to the field of medical device technology, and in particular to a blood pump outlet connection structure and a blood pump assembly. Background Technology

[0002] A left ventricular assist device (LVAD), also known as an artificial blood pump, is connected in parallel with the heart. It can simulate the function of ventricular blood pumping, pumping blood from the ventricles into the body's arterial system and delivering it to blood vessels throughout the body to exchange nutrients, oxygen, carbon dioxide, and other substances. The LVAD can partially or completely replace the function of the heart and is also called an artificial heart. After the blood pump pumps blood, it is delivered to the arteries through artificial blood vessels. The artificial blood vessels are responsible for transporting blood and are surrounded by a reinforcing sheath to protect them and prevent deformation or even collapse of the artificial blood vessels due to compression by human tissue, which would affect the normal transport of blood.

[0003] The outlet tube of the blood pump is connected to the artificial blood vessel-reinforced cannula through a unique structure; and because the space in the human chest cavity is relatively small, the overall size of the left ventricular assist device cannot be too large, and the structure must be compact. Otherwise, it may cause compression of the heart or surrounding tissues, increasing the risk of postoperative complications.

[0004] At the blood pump outlet tube, the artificial blood vessel must be kept straight and free from any compression to ensure smooth blood flow; otherwise, thrombosis can easily form at this location. Current technology involves first fitting the artificial blood vessel onto the blood pump outlet tube, and then securing it with other structures. Artificial blood vessels are typically made of woven fabric, which is very soft and prone to burrs at the ends. Furthermore, to ensure smooth blood flow, the inner diameter of the artificial blood vessel and the outer diameter of the blood pump outlet tube are usually an interference fit, requiring the artificial blood vessel to be stretched before fitting onto the outlet tube. Therefore, the actual assembly and use of artificial blood vessels is very difficult, usually requiring the assistance of tools such as tweezers. After assembly, lint is easily generated (tweezers pull on the ends of the artificial blood vessel, causing the woven fabric at the ends to unravel). It is also difficult for doctors to determine how much of the artificial blood vessel has been properly fitted. If too much is fitted into the blood pump outlet tube, it can cause accumulation, resulting in inadequate clamping; if too little is fitted, the artificial blood vessel may not be securely fixed, posing a risk of bleeding and detachment. Utility Model Content

[0005] This application provides a blood pump outlet connection structure and a blood pump assembly. The connection structure of this application is compact and easy and quick to operate. Doctors can quickly connect it to the blood pump outlet tube, thereby effectively saving surgical time and avoiding the problem of too much or too little artificial blood vessel being inserted.

[0006] This application provides a blood pump outlet connection structure in its first aspect, comprising:

[0007] An artificial blood vessel, the front end of which is fitted around the periphery of the blood pump outlet tube, and a limiting ring is provided inside the front end of the artificial blood vessel.

[0008] A reinforcing cannula is fitted around the periphery of the artificial blood vessel;

[0009] A locking ring is used to fasten the front end of the artificial blood vessel, the front end of the reinforcing sleeve, and the outlet tube;

[0010] The limiting ring is restricted to the outside of the reinforcing sleeve, and the limiting ring and the front end of the reinforcing sleeve abut against each other in the axial direction of the reinforcing sleeve.

[0011] Alternatively, a receiving groove is provided at the end of the front end of the reinforcing sleeve, and the limiting ring is locked in the receiving groove. The limiting ring and the receiving groove abut against each other in both the axial and radial directions of the reinforcing sleeve.

[0012] In some embodiments, the thickness of the cross-section of the limiting ring is greater than or equal to half the thickness of the front end wall of the reinforcing sleeve.

[0013] In some embodiments, the diameter of the limiting ring is 10 mm to 14 mm, the width of the limiting ring is 0.6 mm to 1.0 mm, and the thickness of the cross-section of the limiting ring is 0.15 mm to 2 mm.

[0014] In some embodiments, the front end of the artificial blood vessel is formed with a straight section, and the limiting ring is disposed within the end of the straight section;

[0015] The front end of the reinforcing sleeve has a constricted section and a straight section in front of the constricted section. The straight section is sleeved on the outer periphery of the straight section, and the contact length between the straight section and the straight section is 5.5 mm to 7.5 mm.

[0016] In some embodiments, the limiting ring is a titanium alloy ring, a stainless steel ring, or a PEEK ring.

[0017] In some embodiments, the inner diameter of the artificial blood vessel is 10 mm, 12 mm, or 14 mm.

[0018] In some embodiments, the front end of the reinforcing sleeve is provided with a plurality of gap grooves, the gap grooves penetrate through the inner and outer sides of the front end of the reinforcing sleeve, the gap grooves are connected to the end of the front end of the reinforcing sleeve, and the length of the gap grooves in the axial direction of the reinforcing sleeve is greater than the mating length of the front end of the reinforcing sleeve and the artificial blood vessel.

[0019] The locking ring is sleeved on the outer periphery of the front end of the reinforcing sleeve, which can compress the size of the gap groove and thus fasten the front end of the reinforcing sleeve to the outer periphery of the outlet pipe.

[0020] In some embodiments, the gap grooves are evenly spaced and arranged axially around the reinforcing sleeve.

[0021] In a second aspect, this application also provides a blood pump assembly, including a blood pump outlet connection structure as described in the first aspect and a blood pump, wherein the blood pump has an outlet pipe, and an annular protrusion is formed at the end of the outlet pipe, the annular protrusion protruding from the outer peripheral surface of the outlet pipe at a height of 0.2 mm to 1.2 mm.

[0022] The front end of the artificial blood vessel is sleeved on the outer periphery of the outlet tube, the annular protrusion and the front end of the artificial blood vessel form an abutment, and a limiting ring is provided inside the end of the front end of the artificial blood vessel.

[0023] The reinforcing sleeve is fitted around the periphery of the artificial blood vessel;

[0024] The locking ring is used to fasten the front end of the artificial blood vessel, the front end of the reinforcing sleeve, and the outlet tube, so that the limiting ring and the front end of the reinforcing sleeve form an abutment.

[0025] The limiting ring is confined to the outside of the reinforcing sleeve;

[0026] Alternatively, a receiving groove is provided inside the front end of the reinforcing sleeve, and the limiting ring is locked inside the receiving groove.

[0027] In some embodiments, a step is formed between the body of the blood pump and the outlet tube, and the front end of the artificial blood vessel and the front end of the reinforcing sleeve are fastened between the step and the annular protrusion, wherein the step is capable of abutting against the limiting ring.

[0028] As can be seen from the above technical solutions, this application has the following advantages:

[0029] The prosthetic blood vessel's front end is fitted around the periphery of the blood pump's outlet tube, and a limiting ring is provided inside the end of the prosthetic blood vessel's front end. A reinforcing sleeve is fitted around the periphery of the prosthetic blood vessel, and a locking ring can secure the front end of the prosthetic blood vessel, the front end of the reinforcing sleeve, and the blood pump's outlet tube, so that the limiting ring and the front end of the reinforcing sleeve form an abutment. The limiting ring can be confined to the outside of the reinforcing sleeve, and the limiting ring and the front end of the reinforcing sleeve form an abutment in the axial direction of the reinforcing sleeve. Alternatively, a receiving groove is provided inside the end of the reinforcing sleeve's front end, and the limiting ring is locked within the receiving groove. The locking ring and the receiving groove abut against each other in both the axial and radial directions of the reinforcing sleeve, thus firmly fixing the artificial blood vessel and preventing it from falling off relative to the reinforcing sleeve. This also avoids the problem of the artificial blood vessel being inserted too much or too little into the blood pump outlet tube. Therefore, the connection structure of this application integrates the artificial blood vessel, the reinforcing sleeve, and the locking ring as a whole, which can be assembled and sterilized in advance at the factory. During the operation, the doctor can directly and quickly install the artificial blood vessel onto the blood pump outlet tube in one step through the locking ring, which greatly saves the operation time.

[0030] The blood pump assembly of this application utilizes the aforementioned blood pump outlet connection structure. The blood pump assembly of this application is capable of pumping blood and delivering it to the arterial system through artificial blood vessels to maintain the daily function of tissues in the patient's body. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings.

[0032] Figure 1 This is a schematic diagram of the structure of a blood pump assembly according to an embodiment of this application;

[0033] Figure 2 for Figure 1 A schematic diagram of the blood pump outlet connection structure in the diagram;

[0034] Figure 3 for Figure 1 An exploded view of the blood pump assembly in the image;

[0035] Figure 4 for Figure 2 A schematic diagram of the structure of the front end of the reinforced sleeve;

[0036] Figure 5 for Figure 1 A cross-sectional view of the blood pump assembly and connecting structure at the connection location.

[0037] The meanings of the reference numerals in the attached figures are as follows:

[0038] 1. Artificial blood vessel; 11. Restriction ring; 12. Straight section; 2. Reinforcing sleeve; 21. Receiving groove; 22. Closing section; 23. Straight section; 24. Gap groove; 241. First section; 242. Second section; 243. Third section; 244. Matching protrusion; 3. Locking ring; 31. Clamp; 32. Locking element; 4. Blood pump; 41. Outlet tube; 411. Annular protrusion; 412. Step. Detailed Implementation

[0039] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the present invention and should not be construed as limiting the scope of protection of the present invention.

[0040] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0041] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0042] like Figures 1-5 As shown, in the first aspect, this application provides a blood pump outlet connection structure, including an artificial blood vessel 1, a reinforcing sleeve 2, and a locking ring 3; the front end of the artificial blood vessel 1 is sleeved on the outer periphery of the outlet pipe 41 of the blood pump 4, and a limiting ring 11 is provided in the end of the front end of the artificial blood vessel 1; the reinforcing sleeve 2 is sleeved on the outer periphery of the artificial blood vessel 1; the locking ring 3 can fasten the front end of the artificial blood vessel 1, the front end of the reinforcing sleeve 2, and the outlet pipe 41, so that the limiting ring 11 and the front end of the reinforcing sleeve 2 form an abutment, wherein the limiting ring 11 is restricted to the outside of the reinforcing sleeve 2, and the limiting ring 11 and the front end of the reinforcing sleeve 2 form an abutment in the axial direction of the reinforcing sleeve 2, or, a receiving groove 21 is provided in the end of the front end of the reinforcing sleeve 2, and the limiting ring 11 is locked in the receiving groove 21, and the limiting ring 11 and the receiving groove 21 form an abutment in both the axial and radial directions of the reinforcing sleeve 2.

[0043] The limiting ring 11 is disposed inside the end of the artificial blood vessel 1 and is wrapped by the artificial blood vessel 1. The limiting ring 11 can cause the end of the artificial blood vessel 1 to bulge. The limiting ring 11 and the reinforcing sleeve 2 form an abutment. The limiting ring 11 will not move in the axial direction of the reinforcing sleeve 2, that is, the end of the artificial blood vessel 1 will not move in its axial direction relative to the reinforcing sleeve 2. In this way, this connection structure can firmly fix the end of the artificial blood vessel 1 to the end of the reinforcing sleeve 2, so that the artificial blood vessel 1 will not fall off relative to the reinforcing sleeve 2. Furthermore, the limiting ring 11 can avoid the problem of the artificial blood vessel 1 being too much or too little inserted into the outlet tube 41 of the blood pump 4.

[0044] The connection structure of this application integrates the artificial blood vessel 1, the reinforcing sleeve 2, and the locking ring 3 as a whole. It can be pre-assembled and sterilized in the factory. During the operation, the doctor can directly install the artificial blood vessel 1 onto the outlet tube 41 of the blood pump 4 in one step through the locking ring 3, which greatly saves the operation time.

[0045] It is necessary to explain here that: the artificial blood vessel 1 is generally made of woven fabric. In the existing technology, the artificial blood vessel 1 is first put on the outlet tube 41 of the blood pump 4, and then the artificial blood vessel 1 is tightened by other structures. When the doctor operates, it is easy to put the artificial blood vessel 1 on too much, which will form a pile on the outlet tube 41 of the blood pump 4, causing the subsequent clamp 31 to not be tightened properly. Alternatively, it is easy to put the artificial blood vessel 1 on too little, which will make the artificial blood vessel 1 not secure, and there is a risk of bleeding and falling off. In this application, a limiting ring 11 is set inside the end of the front end of the artificial blood vessel 1. The end wrapped with the limiting ring 11 is restricted to the front end of the reinforcing sleeve 2. The part of the front end of the artificial blood vessel 1 that fits with the reinforcing sleeve 2 can be ironed flat to fit with the inner wall of the front end of the reinforcing sleeve 2 and the outer wall of the outlet tube 41, so as to avoid the front end of the artificial blood vessel 1 piling up when it is fitted with the reinforcing sleeve 2, which would cause the clamp 31 to not be tightened properly.

[0046] When assembling the blood pump outlet connection structure of this application, the locking ring 3 can be first placed around the front end of the reinforcing sleeve 2. Forceps, vascular clamps, or other tools can be used to clamp the artificial blood vessel 1 and the reinforcing sleeve 2 respectively. The rear end of the artificial blood vessel 1 is inserted into the front end of the reinforcing sleeve 2, and the artificial blood vessel 1 is gradually extended into the interior of the reinforcing sleeve 2. When the rear end of the artificial blood vessel 1 extends out from the rear end of the reinforcing sleeve 2, the rear end of the artificial blood vessel 1 is clamped and pulled, so that the limiting ring 11 inside the front end of the artificial blood vessel 1 abuts against the front end of the reinforcing sleeve 2 or the limiting ring 11 is located in the receiving groove 21. At this point, the locking ring 3 can be tightened with the help of tools to pre-lock and fix the reinforcing sleeve 2 and the artificial blood vessel 1, so as to prevent the artificial blood vessel 1 and the reinforcing sleeve 2 from shifting their positions during transportation and transfer.

[0047] When assembling the blood pump outlet connection structure of this application onto the outer periphery of the outlet pipe 41 of the blood pump 4, it is only necessary to loosen the locking ring 3 with the aid of a tool, and directly insert the artificial blood vessel 1, the reinforcing sleeve 2 and the locking ring 3 as a whole onto the outer periphery of the outlet pipe 41 of the blood pump 4, and then tighten the locking ring 3 with the aid of a tool to complete the installation of the artificial blood vessel 1 onto the outlet pipe 41 of the blood pump 4.

[0048] The reinforcing sleeve 2 of this application is made of medical implant-grade material with an interwoven and uniformly distributed porous structure. It can be made of a material with a certain degree of hardness, such as ultra-high molecular weight polyethylene (UHMW-PE). The reinforcing sleeve 2 is located outside the artificial blood vessel 1 and plays a supporting and protective role, preventing the artificial blood vessel 1 from deforming or even collapsing due to compression by human tissue, which would affect the normal transport of blood.

[0049] When the locking ring 3 is tightened, the locking ring 3 exerts a force on the front end of the reinforcing sleeve 2, compressing the size of the front end of the reinforcing sleeve 2 and making it smaller. This causes the front end of the reinforcing sleeve 2 and the front end of the artificial blood vessel 1 to exert a certain force on the outer periphery of the outlet pipe 41 of the blood pump 4. Under the restriction of the reinforcing sleeve 2 and the locking ring 3, an interference fit is formed between the artificial blood vessel 1 and the outlet pipe 41 of the blood pump 4.

[0050] Furthermore, in order to ensure a secure connection, the area where the limiting ring 11 and the front end of the reinforcing sleeve 2 abut against each other cannot be too small.

[0051] In some embodiments, the thickness of the cross-section of the limiting ring 11 is greater than or equal to half the thickness of the front end wall of the reinforcing sleeve 2. The limiting ring 11 and the front end of the reinforcing sleeve 2 are projected onto a projection plane perpendicular to the axial direction of the reinforcing sleeve 2. The pattern formed by the projection of the limiting ring 11 coincides with the pattern formed by the projection of the front end of the reinforcing sleeve 2, and the overlapping area is greater than or equal to half the area of ​​the pattern formed by the projection of the front end of the reinforcing sleeve 2. The area on the limiting ring 11 that abuts against the front end of the reinforcing sleeve 2 is sufficient, so that the limiting ring 11 can be firmly restricted to the front end of the reinforcing sleeve 2. Even if the front end of the reinforcing sleeve 2 loosens due to wear of the locking ring 3 and returns to its original size, the limiting ring 11 can still abut against the front end of the reinforcing sleeve 2, ensuring the tightness between the artificial blood vessel 1 and the reinforcing sleeve 2.

[0052] In some embodiments, the present application defines the dimensions of the limiting ring 11, wherein the diameter of the limiting ring 11 is 10 mm to 14 mm, the width of the limiting ring 11 is 0.6 mm to 1.0 mm, and the thickness of the cross-section of the limiting ring 11 is 0.15 mm to 2 mm.

[0053] Optionally, the inner diameter of the artificial blood vessel 1 is 10mm, 12mm or 14mm.

[0054] To facilitate the fitting of the reinforcing sleeve 2 and the outlet tube 41 of the blood pump 4, the front end of the artificial blood vessel 1 is formed with a straight section 12, which can be ironed flat. The limiting ring 11 is set inside the end of the straight section 12. The front end of the reinforcing sleeve 2 is formed with a constricted section 22 and a straight section 23 in front of the constricted section 22. The straight section 23 is fitted around the outer periphery of the straight section 12. The straight section 12 needs to extend to the constricted section 22 of the reinforcing sleeve 2 by a certain distance to ensure that the straight section 23 only contacts the straight section 12, and the effective contact length between the straight section 23 and the straight section 12 is 5.5mm to 7.5mm.

[0055] The inner diameter of the constricted section 22 at the front end of the reinforcing sleeve 2 gradually decreases from the position away from the straight section 23 to the position connecting to the straight section 23. The straight section 23 at the front end of the reinforcing sleeve 2 can closely fit with the straight section 12 at the front end of the artificial blood vessel 1 to prevent blood leakage from this position. Furthermore, the inner diameter of the main body and the rear end of the reinforcing sleeve 2 is larger than the outer diameter of the artificial blood vessel 1. This can prevent excessive friction between the inner wall of the reinforcing sleeve 2 and the outer wall of the artificial blood vessel 1 when the artificial blood vessel 1 is inserted into the reinforcing sleeve 2, which would cause lint to form on the braided structure of the artificial blood vessel 1 and affect the stability of the artificial blood vessel 1.

[0056] The confinement ring 11 is required to have a certain degree of hardness and biocompatibility. Optionally, the confinement ring 11 can be a titanium alloy ring, a stainless steel ring, or a structural ring made of a polymer material, such as a PEEK ring (PEEK, short for polyether ether ketone, is a special engineering plastic with excellent properties such as high temperature resistance, self-lubrication, easy processing and high mechanical strength). Alternatively, the confinement ring 11 can also be made of materials that are not mentioned above but are well-known to the public and have a certain degree of hardness and biocompatibility.

[0057] When the locking ring 3 is tightened, it can compress the size of the front end of the reinforcing sleeve 2 so that the front end of the reinforcing sleeve 2, the front end of the artificial blood vessel 1 and the outlet pipe 41 of the blood pump 4 form an interference fit, thereby locking the front end of the artificial blood vessel 1 to the outer periphery of the outlet pipe 41 of the blood pump 4.

[0058] Multiple gap grooves 24 are provided at the front end of the reinforcing sleeve 2. The gap grooves 24 penetrate the inner and outer sides of the front end of the reinforcing sleeve 2 and are connected to the end of the front end of the reinforcing sleeve 2. Furthermore, the length of the gap grooves 24 in the axial direction of the reinforcing sleeve 2 is greater than the matching length between the front end of the reinforcing sleeve 2 and the artificial blood vessel 1. Optionally, the gap grooves 24 can extend from the constriction section 22 of the reinforcing sleeve 2 to the end of its straight section 23. The locking ring 3 is sleeved on the outer periphery of the front end of the reinforcing sleeve 2 and can compress the size of the gap grooves 24 to secure the front end of the reinforcing sleeve 2 to the outer periphery of the outlet pipe 41.

[0059] The gap grooves 24 are evenly spaced and arranged axially around the reinforcing sleeve 2.

[0060] In a preferred embodiment, the gap groove 24 includes a first section 241, a second section 242, and a third section 243. The first section 241 and the third section 243 both extend along the axial direction of the reinforcing sleeve 2. The second section 242 is U-shaped, with its two ends connected to the first section 241 and the third section 243, respectively. A mating protrusion 244 is also formed at the front end of the reinforcing sleeve 2. The mating protrusion 244 is formed on the sidewall opposite to the second section 242, and the end of the mating protrusion 244 extends into the second section 242 of the gap groove 24. Initially, when the locking ring 3 is tightened, the first section 241 and the third section 243 of the gap groove 24 are compressed, and the mating protrusion 244 can move closer to the second section 242 of the gap groove 24, and the front end size of the reinforcing sleeve 2 becomes smaller; however, when the mating protrusion 244 abuts against the side wall of the second section 242 of the gap groove 24, the front end of the reinforcing sleeve 2 cannot be compressed further, and the locking ring 3 and the front end of the reinforcing sleeve 2 can form an interference fit to avoid over-tightening of the locking ring 3, which would cause the outlet tube 41 of the blood pump 4 to be squeezed and deformed.

[0061] The locking ring 3 includes a clamp 31 and a locking element 32. The main body of the clamp 31 is fitted around the outer periphery of the front end of the reinforcing sleeve 2. The two ends of the clamp 31 are reserved with a fitting gap. The locking element 32 and the two ends of the clamp 31 are connected to each other. The fitting gap is compressed to realize the size of the compression gap groove 24, so as to fasten the front end of the reinforcing sleeve 2 and the front end of the artificial blood vessel 1 to the outer periphery of the outlet pipe 41.

[0062] In a second aspect, this application also provides a blood pump assembly, including a blood pump outlet connection structure as described in the first aspect and a blood pump 4. The blood pump 4 has an outlet pipe 41, and an annular protrusion 411 is formed at the end of the outlet pipe 41. The height of the annular protrusion 411 protruding from the outer peripheral surface of the outlet pipe 41 is 0.2 mm to 1.2 mm. The front end of an artificial blood vessel 1 is sleeved on the outer periphery of the outlet pipe 41, and the annular protrusion 411 and the front end of the artificial blood vessel 1 form an abutment. A limiting ring 11 is provided in the end of the front end of the artificial blood vessel 1. A reinforcing sleeve 2 is sleeved on the outer periphery of the artificial blood vessel 1. A locking ring 3 is used to fasten the front end of the artificial blood vessel 1, the front end of the reinforcing sleeve 2, and the outlet pipe 41, so that the limiting ring 11 and the front end of the reinforcing sleeve 2 form an abutment. The limiting ring 11 is restricted to the outside of the reinforcing sleeve 2, or a receiving groove 21 is provided in the end of the front end of the reinforcing sleeve 2, and the limiting ring 11 is locked in the receiving groove 21.

[0063] A step 412 is formed between the body of the blood pump 4 and the outlet tube 41. The front end of the artificial blood vessel 1 and the front end of the reinforcing sleeve 2 are fastened between the step 412 and the annular protrusion 411. The step 412 can abut against the limiting ring 11. At the same time, the limiting ring 11 abuts against the front end of the reinforcing sleeve 2, and the annular protrusion 411 abuts against the inner wall of the front end of the artificial blood vessel 1. Thus, the artificial blood vessel 1 and the reinforcing sleeve 2 can be firmly connected to the outer periphery of the outlet tube 41 of the blood pump 4.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. A blood pump outlet connection structure, characterized in that, include: An artificial blood vessel, the front end of which is fitted around the periphery of the blood pump outlet tube, and a limiting ring is provided inside the front end of the artificial blood vessel. A reinforcing cannula is fitted around the periphery of the artificial blood vessel; A locking ring is used to fasten the front end of the artificial blood vessel, the front end of the reinforcing sleeve, and the outlet tube; The limiting ring is restricted to the outside of the reinforcing sleeve, and the limiting ring and the front end of the reinforcing sleeve abut against each other in the axial direction of the reinforcing sleeve. Alternatively, a receiving groove is provided at the end of the front end of the reinforcing sleeve, and the limiting ring is locked in the receiving groove. The limiting ring and the receiving groove abut against each other in both the axial and radial directions of the reinforcing sleeve.

2. The blood pump outlet connection structure according to claim 1, characterized in that, The thickness of the cross-section of the limiting ring is greater than or equal to half the thickness of the front end wall of the reinforcing sleeve.

3. The blood pump outlet connection structure according to claim 1, characterized in that, The diameter of the limiting ring is 10 mm to 14 mm, the width of the limiting ring is 0.6 mm to 1.0 mm, and the thickness of the cross-section of the limiting ring is 0.15 mm to 2 mm.

4. The blood pump outlet connection structure according to claim 3, characterized in that, The artificial blood vessel has a straight section at its front end, and the limiting ring is disposed within the end of the straight section. The front end of the reinforcing sleeve has a constricted section and a straight section in front of the constricted section. The straight section is sleeved on the outer periphery of the straight section, and the contact length between the straight section and the straight section is 5.5 mm to 7.5 mm.

5. The blood pump outlet connection structure according to claim 1, characterized in that, The limiting ring is a titanium alloy ring, a stainless steel ring, or a PEEK ring.

6. The blood pump outlet connection structure according to claim 1, characterized in that, The inner diameter of the artificial blood vessel is 10mm, 12mm, or 14mm.

7. The blood pump outlet connection structure according to claim 1, characterized in that, The front end of the reinforcing sleeve is provided with multiple gap grooves, which penetrate the inner and outer sides of the front end of the reinforcing sleeve. The gap grooves are connected to the end of the front end of the reinforcing sleeve, and the length of the gap grooves in the axial direction of the reinforcing sleeve is greater than the mating length of the front end of the reinforcing sleeve and the artificial blood vessel. The locking ring is sleeved on the outer periphery of the front end of the reinforcing sleeve, which can compress the size of the gap groove and thus fasten the front end of the reinforcing sleeve to the outer periphery of the outlet pipe.

8. The blood pump outlet connection structure according to claim 7, characterized in that, The gap grooves are evenly spaced and arranged axially around the reinforcing sleeve.

9. A blood pump assembly, characterized in that, The blood pump includes the blood pump outlet connection structure and the blood pump according to any one of claims 1-8, the blood pump having an outlet pipe, the end of the outlet pipe having an annular protrusion, the annular protrusion protruding from the outer peripheral surface of the outlet pipe at a height of 0.2 mm to 1.2 mm; The front end of the artificial blood vessel is sleeved on the outer periphery of the outlet tube, the annular protrusion and the front end of the artificial blood vessel form an abutment, and a limiting ring is provided inside the end of the front end of the artificial blood vessel. The reinforcing sleeve is fitted around the periphery of the artificial blood vessel; The locking ring is used to fasten the front end of the artificial blood vessel, the front end of the reinforcing sleeve, and the outlet tube, so that the limiting ring and the front end of the reinforcing sleeve form an abutment. The limiting ring is confined to the outside of the reinforcing sleeve; Alternatively, a receiving groove is provided inside the front end of the reinforcing sleeve, and the limiting ring is locked inside the receiving groove.

10. The blood pump assembly according to claim 9, characterized in that, A step is formed between the body of the blood pump and the outlet tube. The front end of the artificial blood vessel and the front end of the reinforcing sleeve are fastened between the step and the annular protrusion. The step can abut against the limiting ring.

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