Quick connection device for blood pump and artificial blood vessel and connection method thereof

Abstract

The application discloses a quick connecting device for a blood pump and an artificial blood vessel and a connecting method thereof. The quick connecting device comprises a fixing sleeve and a locking assembly. The fixing sleeve is provided with a fastening ring with a first notch and an inner sleeve ring with a second notch, which can be elastically deformed. The inner sleeve ring is arranged in the fastening ring, and a gap is left between the inner sleeve ring and the fastening ring, so as to be used for sleeving the artificial blood vessel outside the inner sleeve ring. One end of the inner sleeve ring away from the artificial blood vessel is integrally connected to the fastening ring, and the second notch is arranged in a radial direction opposite to the first notch. The fastening ring is provided with two fastening ends at the first notch, and the locking assembly is connected to the two fastening ends. The locking assembly is used for driving the two fastening ends to be close to each other, so that the inner diameters of the fastening ring and the inner sleeve ring are contracted, the inner sleeve ring is pressed on an outlet pipe of the blood pump, and the fastening ring and the inner sleeve ring are matched to clamp the artificial blood vessel. The application is convenient and fast to connect, safe and reliable, and can guarantee sealing performance.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a quick connection device and method for connecting a blood pump and an artificial blood vessel. Background Technology

[0002] A blood pump, also known as a ventricular assist device, is connected to the patient's ventricle and aorta via a parallel bypass. The inlet tube of the blood pump is inserted into the ventricle through the apical opening of the heart, and the outlet tube is connected to the aorta via an artificial blood vessel. When the motor drives the impeller of the blood pump, the centrifugal force of the impeller causes blood to enter the pump chamber from the ventricle through the inlet tube, and then exit from the outlet tube, entering the aorta through the bridged artificial blood vessel, thereby supporting the patient's blood circulation.

[0003] Currently, the traditional method for connecting the outlet tube of a blood pump to an artificial blood vessel typically uses clamps. For example, Chinese invention patent application CN102357267A, published on February 22, 2012, discloses an outlet connection mechanism for a left ventricular assist pump. This mechanism involves directly fitting the artificial blood vessel onto the outlet tube of the blood pump and then securing it with clamps. Artificial blood vessels are generally quite soft, making them difficult to fit onto the outlet tube of the blood pump. This often requires the assistance of tools such as forceps, making installation very inconvenient, leading to longer surgical times and increased surgical risks. Furthermore, clamps are usually made of metal, which cannot guarantee a reliable seal. Leakage can endanger the patient's life. Therefore, existing technologies often add sealing rings to achieve a seal, which undoubtedly increases the number of components used and the difficulty of connection. Summary of the Invention

[0004] The problem to be solved by the present invention is to provide a quick connection device and connection method for blood pumps and artificial blood vessels, so as to overcome the defects of existing connection devices that are inconvenient to install and difficult to connect.

[0005] The technical solution adopted by this invention to solve its technical problem is: a quick connection device for a blood pump and an artificial blood vessel, comprising: a fixing sleeve and a locking assembly. The fixing sleeve is provided with a fastening ring with a first notch and an inner ring with a second notch, both of which are elastically deformable. The inner ring is disposed inside the fastening ring, and a gap is left between the inner ring and the fastening ring for fitting the artificial blood vessel on the outside of the inner ring. The end of the inner ring away from the artificial blood vessel is integrally connected to the fastening ring, and the second notch is radially opposite to the first notch. The fastening ring has two fastening ends located at the first notch. The locking assembly is connected to the two fastening ends and is used to drive the two fastening ends to move closer to each other, so that the inner diameters of both the fastening ring and the inner ring are contracted, thereby pressing the inner ring onto the outlet pipe of the blood pump, and the fastening ring and the inner ring cooperate to clamp the artificial blood vessel.

[0006] As a further improvement of the present invention, the locking assembly includes a locking screw and a locking nut, and both of the fastening ends are provided with coaxial mounting holes. The locking screw passes through the two mounting holes and is threaded to the locking nut.

[0007] As a further improvement of the present invention, a first anti-loosening washer and an anti-loosening washer are installed between the screw head of the locking screw and one of the corresponding fastening ends, and a second anti-loosening washer is installed between the locking nut and the other fastening end, and the locking nut and the second anti-loosening washer are welded and fixed.

[0008] As a further improvement of the present invention, an anti-loosening nut is installed at the end of the locking screw, and the locking screw is welded and fixed to the anti-loosening nut.

[0009] As a further improvement of the present invention, the quick connection device for the blood pump and the artificial blood vessel also includes a protective sleeve, which is fixedly connected to the fastening ring and fitted onto the artificial blood vessel.

[0010] As a further improvement of the present invention, the quick connection device for blood pump and artificial blood vessel also includes a positioning pin. The outer peripheral surface of the fastening ring facing the protective sleeve is provided with an annular groove. One end of the protective sleeve is provided with a connecting ring. The connecting ring is fitted onto one end of the fastening ring and covers the annular groove. The positioning pin is inserted into the connecting ring and engages with the annular groove.

[0011] As a further improvement of the present invention, the connecting ring is provided with two pairs of insertion holes, each pair of insertion holes including two coaxial and through holes; the positioning pin is provided with an arc section and two straight pin sections connected to both ends of the arc section, the arc section is clamped on the outer circumferential surface of the connecting ring, the two straight pin sections are respectively inserted into the two pairs of insertion holes, and the part of the straight pin section inserted into the connecting ring just falls into the annular groove; the ends of the two straight pin sections that pass through the corresponding insertion holes are bent toward each other and held tightly on the outer circumferential surface of the connecting ring.

[0012] As a further improvement of the present invention, one end of the inner sleeve is bent outward into a connecting ring with a U-shaped cross section, and the connecting ring is integrally connected to one end face of the fastening ring; the outlet pipe is provided with a retaining ring at its port, and when the inner sleeve is fitted onto the outlet pipe, the other end of the inner sleeve cooperates with the retaining ring to form a stop.

[0013] As a further improvement of the present invention, the fastening ring and the inner ring are integrally injection molded from a soft medical polymer material.

[0014] The present invention also provides a connection method for a quick connection device for a blood pump and an artificial blood vessel, comprising the following steps:

[0015] S1, Fit one end of the artificial blood vessel onto the inner ring;

[0016] S2, the fixing sleeve carrying the artificial blood vessel is attached to the outlet tube of the blood pump;

[0017] S3, tighten the locking assembly on the fastening ring to shrink the inner diameter of the fastening ring and the inner sleeve ring, thereby pressing the inner sleeve ring onto the outlet pipe; as the locking assembly is continuously tightened, the inner diameter of the fastening ring is further shrunk until the fastening ring and the inner sleeve ring cooperate to clamp the artificial blood vessel.

[0018] S4, fit the protective sleeve onto one end of the fastening ring;

[0019] S5, insert the positioning pin into the protective sleeve to achieve a fixed connection between the protective sleeve and the fastening ring.

[0020] The beneficial effects of this invention are:

[0021] 1) This invention provides a quick connection device and method for connecting a blood pump and an artificial blood vessel. The device includes a fixing sleeve and a locking assembly. The fixing sleeve has a fastening ring and an inner ring, both capable of elastic deformation. Before connecting to the blood pump, the artificial blood vessel is first fitted onto the inner ring of the fixing sleeve. Then, the fixing sleeve, carrying the artificial blood vessel, is fitted onto the outlet tube of the blood pump. Finally, the locking assembly is used to lock and fix the connection, thus achieving a quick connection between the artificial blood vessel and the outlet tube. The operation is very convenient and fast, effectively reducing the connection difficulty during surgery and shortening the operation time. Furthermore, the artificial blood vessel is not in direct contact with the outlet tube, but is positioned between the fastening ring and the inner ring of the fixing sleeve, clamped and fixed by the fastening ring and the inner ring. This not only achieves a reliable connection and fixation, but also ensures sealing performance by using the inner ring as a sealing ring, eliminating the need for additional components.

[0022] 2) The locking component of this invention has anti-loosening and anti-fall-off functions, making the connection safer and more reliable.

[0023] 3) This invention uses a protective sleeve to protect the artificial blood vessel and uses a positioning pin to fix the protective sleeve to the fixed sleeve, which can achieve a reliable connection and is easy to assemble. Attached Figure Description

[0024] Figure 1 This is a perspective view of the quick connection device for a blood pump and an artificial blood vessel according to the present invention;

[0025] Figure 2 This is an exploded view of the quick connection device for a blood pump and an artificial blood vessel according to the present invention;

[0026] Figure 3 This is a top view of the connection between the fixing sleeve and the artificial blood vessel in this invention;

[0027] Figure 4 This is a perspective view of the assembly of the fixing sleeve and the locking component in this invention;

[0028] Figure 5 This is a perspective view of the assembly of the fixing sleeve and the locking component in this invention.

[0029] Figure 6 This is a cross-sectional view of the quick connection device for a blood pump and an artificial blood vessel according to the present invention;

[0030] Figure 7 This is a perspective view of the assembly of the protective sleeve and the positioning pin in this invention;

[0031] Figure 8 This is a flowchart illustrating the steps of a connection method for a quick connection device for a blood pump and an artificial blood vessel according to the present invention.

[0032] Referring to the accompanying drawings, the following explanations are provided:

[0033] 1. Fixing sleeve; 11. Fastening ring; 111. First notch; 112. Fastening end;

[0034] 1121, Mounting hole; 113, Annular groove; 12, Inner collar; 121, Second notch;

[0035] 122. Connecting ring; 13. Gap; 2. Locking assembly; 21. Locking screw; 22. Locking nut; 23. First anti-loosening washer; 24. Anti-loosening washer; 25. Second anti-loosening washer; 26. Anti-loosening nut; 3. Artificial blood vessel; 4. Outlet tube; 41. Retaining ring; 5. Protective sleeve; 51. Connecting ring; 511. Insertion hole; 6. Positioning pin; 61. Arc section; 62. Straight pin section. Detailed Implementation

[0036] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0037] Example 1

[0038] See Figures 1 to 7 This invention provides a quick connection device for a blood pump and an artificial blood vessel, used to quickly connect an artificial blood vessel 3 to the outlet pipe 4 of the blood pump. The quick connection device includes a fixing sleeve 1 and a locking assembly 2. The fixing sleeve 1 is provided with a fastening ring 11 and an inner ring 12, both of which can undergo elastic deformation. Both the fastening ring 11 and the inner ring 12 are annular, and the fastening ring 11 has a first notch 111, and the inner ring 12 has a second notch 121, so that the inner diameter of the fastening ring 11 and the inner ring 12 can expand or contract when elastic deformation occurs.

[0039] The second notch 121 and the first notch 111 are arranged opposite each other along the radial direction of the fixed sleeve 1.

[0040] Optionally, the width of the second notch 121 is the same as that of the first notch 111; the inner diameter of the inner ring 12 in the free state is larger than the outer diameter of the outlet tube 4 of the blood pump.

[0041] See Figures 3 to 5 The inner ring 12 is coaxially disposed inside the fastening ring 11, and the end of the inner ring 12 away from the artificial blood vessel 3 is integrally connected to the fastening ring 11; at the same time, a gap 13 is left between the inner ring 12 and the fastening ring 11, which is used to fit the artificial blood vessel 3 on the outside of the inner ring 12.

[0042] Furthermore, the fastening ring 11 has two fastening ends 112 located at the first notch 111, and the locking assembly 2 is connected to the two fastening ends 112.

[0043] Before connecting the artificial blood vessel 3 to the outlet pipe 4 of the blood pump, one end of the artificial blood vessel 3 is first fitted along the other end of the inner collar 12, so that it is within the gap 13; then the fixing sleeve 1 carrying the artificial blood vessel 3 can be quickly fitted onto the outlet pipe 4 of the blood pump; then the locking component 2 is tightened to drive the two fastening ends 112 to move closer to each other, so that the inner diameter of the fastening ring 11 is contracted, and at the same time, the inner diameter of the inner collar 12 is also contracted under the action of the fastening ring 11, thereby pressing the inner collar 12 tightly onto the outlet pipe 4 of the blood pump; as the locking component 2 is continuously tightened, the inner diameter of the fastening ring 11 is further contracted until the fastening ring 11 and the inner collar 12 cooperate to clamp the artificial blood vessel 3.

[0044] As can be seen, this invention achieves a quick connection between the artificial blood vessel 3 and the outlet tube 4 by first fitting the artificial blood vessel 3 onto the inner ring 12 of the fixing sleeve 1, then fitting the fixing sleeve 1 carrying the artificial blood vessel 3 onto the outlet tube 4 of the blood pump, and finally locking it in place using the locking component 2. The operation is very convenient and quick, effectively reducing the connection difficulty during surgery and shortening the operation time. In addition, the artificial blood vessel 3 is not in direct contact with the outlet tube 4, but is located between the fastening ring 11 and the inner ring 12 of the fixing sleeve 1, and is clamped and fixed by the fastening ring 11 and the inner ring 12. This not only achieves a reliable connection and fixation, but also ensures a sealing performance by using the inner ring 12 as a sealing ring, eliminating the need for additional parts.

[0045] See Figures 4 to 6 One end of the inner sleeve 12 is bent outward to form a U-shaped connecting ring 122. The connecting ring 122 protrudes outward from the end face of the fastening ring 11 facing the blood pump, and the connecting ring 122 is integrally connected to the edge of the end face of the fastening ring 11. This invention, by designing the fixing sleeve 1 in this structure, facilitates processing and provides more ample space for the artificial blood vessel 3, increasing the length of the artificial blood vessel 3 fitted onto the inner sleeve 12, thereby increasing the contact area. It also facilitates elastic deformation of the fastening ring 11 and the inner sleeve 12 for clamping and fixing the artificial blood vessel 3. The other end of the inner sleeve 12 extends to the middle of the fastening ring 11. A retaining ring 41 is provided at the port of the outlet pipe 4. When the inner sleeve 12 is fitted onto the outlet pipe 4, the other end of the inner sleeve 12 cooperates with the retaining ring 41 to form a stop, effectively preventing the fixing sleeve 1 from detaching from the outlet pipe 4, increasing the safety and reliability of the connection.

[0046] In this invention, the fastening ring 11 and the inner ring 12 are integrally injection molded from a soft medical polymer material, preferably medical implant-grade TPU, which has advantages such as good biocompatibility, stability, and flexibility, and can ensure sealing performance. In addition, other plastic materials with equivalent or similar properties should also be suitable for the fixing sleeve 1 in this invention.

[0047] See Figure 2and Figure 4 The locking assembly 2 includes a locking screw 21 and a locking nut 22. Both fastening ends 112 are provided with coaxial mounting holes 1121. The locking screw 21 passes through the two mounting holes 1121 and is threaded to the locking nut 22. When the locking screw 21 is tightened, the locking screw 21 will force the two fastening ends 112 to move closer to each other.

[0048] Each of the two fastening ends 112 is provided with a receiving groove. The screw head of the locking screw 21 is located in one of the receiving grooves, and a first anti-loosening washer 23 and an anti-loosening washer 24 are installed between the screw head and one side wall of the receiving groove. The locking nut 22 is located in the other receiving groove, and a second anti-loosening washer 25 is installed between the locking nut 22 and one side wall of the receiving groove.

[0049] Optionally, both the first anti-slip washer 23 and the second anti-slip washer 25 are square washers, which can prevent the screw head and the locking nut 22 from being pulled out of the corresponding mounting hole 1121.

[0050] Optionally, the anti-loosening gasket 24 is a butterfly-shaped gasket to prevent loosening.

[0051] The locking nut 22 is welded and fixed to the second anti-loosening washer 25. The locking nut 22 is prevented from loosening by the cooperation between the second anti-loosening washer 25 and the receiving groove.

[0052] It is worth mentioning that the end of the locking screw 21 is also equipped with an anti-loosening nut 26, and the locking screw 21 and the anti-loosening nut 26 are welded and fixed, so that the locking component 2 is always connected to the fixing sleeve 1, ensuring that the locking component 2 will not come off the fixing sleeve 1, which is safer.

[0053] The quick connection device for blood pump and artificial blood vessel of the present invention also includes a protective sleeve 5 and a positioning pin 6. The protective sleeve 5 is fixedly connected to the fastening ring 11 and fitted onto the artificial blood vessel 3 to protect the internal artificial blood vessel 3.

[0054] like Figure 7 As shown, the protective sleeve 5 is cylindrical in shape, with multiple elongated grooves spaced apart on its outer circumference to ensure that the protective sleeve 5 has a certain degree of elasticity and can be slightly bent. The elongated groove structure of the protective sleeve 5 can adopt the construction of the patent cited in the background art.

[0055] See Figure 4 , Figure 6 and Figure 7 The outer circumferential surface of the fastening ring 11 facing the protective sleeve 5 is provided with an annular groove 113. One end of the protective sleeve 5 is provided with a connecting ring 51. The connecting ring 51 is fitted onto one end of the fastening ring 11 and covers the annular groove 113. The positioning pin 6 is inserted into the connecting ring 51 and engages with the annular groove 113.

[0056] Specifically, the connecting ring 51 has two pairs of insertion holes 511, each pair of insertion holes 511 containing two coaxial and through holes. The positioning pin 6 has an arc-shaped section 61 and two straight pin sections 62 integrally connected to both ends of the arc-shaped section 61, and the arc-shaped section 61 and the two straight pin sections 62 connected to its ends form a U-shape. The arc-shaped section 61 is approximately a quarter-circle arc, which is clamped to the outer circumferential surface of the connecting ring 51. The two straight pin sections 62 are respectively inserted into the two pairs of insertion holes 511, and the part of the straight pin section 62 inserted into the connecting ring 51 falls exactly into the annular groove 113, thereby forming a locking position. The ends of the two straight pin sections 62 that are inserted from the corresponding insertion holes 511 are bent towards each other and held tightly to the outer circumferential surface of the connecting ring 51 to prevent the positioning pin 6 from coming off the connecting ring 51. The present invention uses the positioning pin 6 to fix the protective sleeve 5 to the fixed sleeve 1, which can achieve a reliable connection and is easy to assemble.

[0057] Example 2

[0058] See Figures 1 to 8 The present invention also provides a connection method for a quick connection device for a blood pump and an artificial blood vessel, based on the quick connection device for a blood pump and an artificial blood vessel in Embodiment 1, comprising the following steps:

[0059] S1, fit one end of the artificial blood vessel 3 onto the inner collar 12. During the fitting process, the locking component 2 can be tightened first or the fixing sleeve 1 can be pressed by hand to shrink the inner diameter of the inner collar 12, so as to facilitate the fitting of the artificial blood vessel 3. After the fitting is completed, it can be restored to its original state.

[0060] It should be noted that before step S1, the locking component 2 has been installed on the fixing sleeve 1 (e.g., Figure 4 (As shown).

[0061] S2, the fixing sleeve 1 carrying the artificial blood vessel 3 is attached to the outlet tube 4 of the blood pump.

[0062] S3, tighten the locking component 2 on the fastening ring 11 to shrink the inner diameter of the fastening ring 11 and the inner sleeve ring 12, thereby pressing the inner sleeve ring 12 onto the outlet pipe 4; as the locking component 2 is continuously tightened, the inner diameter of the fastening ring 11 is further shrunken until the fastening ring 11 and the inner sleeve ring 12 cooperate to clamp the artificial blood vessel 3.

[0063] S4, fit the connecting ring 51 of the protective sleeve 5 onto the fastening ring 11.

[0064] S5, insert the positioning pin 6 into the protective sleeve 5. The two straight pin sections 62 of the positioning pin 6 are respectively inserted into the two pairs of insertion holes 511 of the connecting ring 51. The part of the straight pin section 62 inserted into the connecting ring 51 just falls into the annular groove 113 of the fastening ring 11, thereby forming a locking position. Then, bend the ends of the two straight pin sections 62 that are inserted from the corresponding insertion holes 511 towards each other and hug the outer circumference of the connecting ring 51 to achieve a fixed connection between the protective sleeve 5 and the fastening ring 11, thus completing the connection.

[0065] In summary, the present invention provides a quick connection device and method for connecting a blood pump and an artificial blood vessel. By configuring a fixing sleeve 1 and a locking assembly 2, the fixing sleeve 1 is equipped with a fastening ring 11 and an inner ring 12, both capable of elastic deformation. Before connecting to the blood pump, the artificial blood vessel 3 is first fitted onto the inner ring 12 of the fixing sleeve 1. Then, the fixing sleeve 1, carrying the artificial blood vessel 3, is fitted onto the outlet pipe 4 of the blood pump. Finally, the locking assembly 2 is used to lock and fix it, thereby achieving a quick connection between the artificial blood vessel 3 and the outlet pipe 4. The operation is very convenient and fast, effectively reducing the connection difficulty during surgery and shortening the operation time. Furthermore, the artificial blood vessel 3 is not in direct contact with the outlet pipe 4, but is positioned between the fastening ring 11 and the inner ring 12 of the fixing sleeve 1, clamped and fixed by the fastening ring 11 and the inner ring 12. This not only achieves a reliable connection and fixation, but also ensures sealing performance by using the inner ring 12 as a sealing ring, eliminating the need for additional components. Simultaneously, the locking assembly 2 of the present invention has anti-loosening and anti-fall-off functions, making the connection safer and more reliable. In addition, the present invention uses a protective sleeve 5 to protect the artificial blood vessel 3, and uses a positioning pin 6 to fix the protective sleeve 5 to the fixed sleeve 1, which can achieve a reliable connection and is easy to assemble.

[0066] Many specific details have been set forth in the foregoing description to provide a thorough understanding of the present invention. However, the above description is merely a preferred embodiment of the present invention, and the present invention can be implemented in many other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed above. Furthermore, any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, using the methods and techniques disclosed above, without departing from the scope of the present invention. Any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention, without departing from the content of the present invention, shall still fall within the protection scope of the present invention.

Claims

1. A quick connection device for a blood pump and an artificial blood vessel, characterized in that, include: The fixing sleeve (1) and locking assembly (2) are provided. The fixing sleeve (1) is provided with a fastening ring (11) with a first notch (111) that can elastically deform and an inner ring (12) with a second notch (121). The inner ring (12) is located inside the fastening ring (11), and a gap (13) is left between the inner ring (12) and the fastening ring (11) for fitting an artificial blood vessel (3) on the outside of the inner ring (12). The end of the inner ring (12) away from the artificial blood vessel (3) is integrally connected to the fastening ring (11), and the second notch (121) is closed. The fastening ring (11) is arranged radially opposite to the first notch (111); the fastening ring (11) has two fastening ends (112) located at the first notch (111), and the locking assembly (2) is connected to the two fastening ends (112). The locking assembly (2) is used to drive the two fastening ends (112) to move closer to each other, so that the inner diameters of the fastening ring (11) and the inner ring (12) are both contracted, thereby pressing the inner ring (12) onto the outlet pipe (4) of the blood pump, and the fastening ring (11) and the inner ring (12) cooperate to clamp the artificial blood vessel (3).

2. The quick connection device for a blood pump and an artificial blood vessel according to claim 1, characterized in that: The locking assembly (2) includes a locking screw (21) and a locking nut (22). Both fastening ends (112) are provided with coaxial mounting holes (1121). The locking screw (21) passes through the two mounting holes (1121) and is threaded to the locking nut (22).

3. The quick connection device for a blood pump and an artificial blood vessel according to claim 2, characterized in that: A first anti-loosening washer (23) and an anti-loosening washer (24) are installed between the screw head of the locking screw (21) and one of the corresponding fastening ends (112), and a second anti-loosening washer (25) is installed between the locking nut (22) and the other fastening end (112), and the locking nut (22) and the second anti-loosening washer (25) are welded and fixed.

4. The quick connection device for a blood pump and an artificial blood vessel according to claim 2, characterized in that: The locking screw (21) is fitted with an anti-loosening nut (26) at its end, and the locking screw (21) is welded and fixed to the anti-loosening nut (26).

5. The quick connection device for a blood pump and an artificial blood vessel according to claim 1, characterized in that: It also includes a protective sleeve (5), which is fixedly connected to the fastening ring (11) and fitted onto the artificial blood vessel (3).

6. The quick connection device for a blood pump and an artificial blood vessel according to claim 5, characterized in that: It also includes a positioning pin (6), and the outer circumferential surface of the fastening ring (11) facing the protective sleeve (5) is provided with an annular groove (113). One end of the protective sleeve (5) is provided with a connecting ring (51). The connecting ring (51) is fitted on one end of the fastening ring (11) and covers the annular groove (113). The positioning pin (6) is inserted into the connecting ring (51) and engages with the annular groove (113).

7. The quick connection device for a blood pump and an artificial blood vessel according to claim 6, characterized in that: The connecting ring (51) is provided with two pairs of insertion holes (511), each pair of insertion holes (511) includes two coaxial and through holes; the positioning pin (6) is provided with an arc section (61) and two straight pin sections (62) connected to both ends of the arc section (61). The arc section (61) is clamped on the outer circumferential surface of the connecting ring (51). The two straight pin sections (62) are respectively inserted into the two pairs of insertion holes (511), and the part of the straight pin section (62) inserted into the connecting ring (51) just falls into the annular groove (113); the ends of the two straight pin sections (62) that are inserted from the corresponding insertion holes (511) are bent toward each other and hug the outer circumferential surface of the connecting ring (51).

8. The quick connection device for a blood pump and an artificial blood vessel according to claim 1, characterized in that: One end of the inner sleeve (12) is bent outward to form a connecting ring (122) with a U-shaped cross section. The connecting ring (122) is integrally connected to one end face of the fastening ring (11). The outlet pipe (4) is provided with a retaining ring (41) at its port. When the inner sleeve (12) is fitted onto the outlet pipe (4), the other end of the inner sleeve (12) cooperates with the retaining ring (41) to form a stop.

9. The quick connection device for a blood pump and an artificial blood vessel according to claim 1, characterized in that: The fastening ring (11) and the inner ring (12) are integrally injection molded from a soft medical polymer material.

10. A connection method for a quick connection device for a blood pump and an artificial blood vessel as described in claim 6, characterized in that, Includes the following steps: S1, one end of the artificial blood vessel (3) is fitted onto the inner ring (12); S2, the fixing sleeve (1) carrying the artificial blood vessel (3) is fitted onto the outlet tube (4) of the blood pump; S3, tighten the locking assembly (2) on the fastening ring (11) to shrink the inner diameter of the fastening ring (11) and the inner sleeve ring (12), thereby pressing the inner sleeve ring (12) onto the outlet pipe (4); as the locking assembly (2) is continuously tightened, the inner diameter of the fastening ring (11) is further shrunk until the fastening ring (11) and the inner sleeve ring (12) cooperate to clamp the artificial blood vessel (3); S4, the protective sleeve (5) is fitted onto one end of the fastening ring (11); S5, insert the positioning pin (6) into the protective sleeve (5) to achieve a fixed connection between the protective sleeve (5) and the fastening ring (11).

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