Rotatable platelet-rich plasma preparation device

Abstract

The utility model relates to the technical field of medical instruments, and discloses a rotatable platelet-rich plasma preparation device. The rotatable platelet-rich plasma preparation device comprises a centrifugal tube, a rotating head and a connecting pipeline, the rotating end of the rotating head transversely penetrates through the centrifugal tube and then is connected with the inlet and outlet end of the centrifugal tube through the connecting pipeline, and the fixed end of the rotating head is connected with a liquid extraction device through the connecting pipeline. According to the rotatable centrifugal preparation device for the platelet-rich plasma, the central tube is arranged in the centrifugal tube, the stressed part relative to the rotating assembly is adjusted to be the central tube with higher strength, and the hose which is most likely to fail originally only plays a connecting role after being adjusted and is not subjected to the torsion action any more, so that the centrifugal preparation device for the platelet-rich plasma can be used for preparing the platelet-rich plasma. And failure risk points in the prior art are effectively avoided.

Description

[0001] The present application claims the priority of patent application No. 202420049959.3 (the filing date of the prior application is January 9, 2024, and the utility model name is a rotatable platelet-rich plasma preparation device). TECHNICAL FIELD

[0002] The utility model relates to the technical field of medical apparatus and instruments, and particularly relates to a rotatable platelet-rich plasma preparation device for separating whole blood to obtain platelet-rich plasma or other blood components with a required concentration. BACKGROUND

[0003] The existing same type of horizontal centrifugal container product structure is relatively complex, is usually composed of two centrifugal chambers, a middle partition block, dry / branch pipes and a tee joint, the middle block also needs to have an exhaust valve for communicating the two centrifugal chambers and a guide channel for the dry pipe to pass through. When installing, the dry pipe needs to be first inserted through the reversing hole on the rotating base and chuck, then the centrifugal container is installed on the chuck of the rotating base, the pipes in other parts are installed in the corresponding locks, then the syringe connecting pipe joint is finally installed on the driving device. During the centrifugation process, the centrifugal container and the pipe need to form differential rotation to remove the torsional moment of the pipe caused by rotation, so as to realize the continuous centrifugation function.

[0004] In actual use, the horizontal container structure of the rotatable platelet-rich plasma centrifugal preparation device in the prior art is relatively complex; due to the rotation principle, the installation process of the centrifugal assembly is relatively complex, the connecting hose of the centrifugal container and the pipe joint is the main stressed component, and the stress borne by the hose mainly includes the torsional moment generated by differential rotation and acceleration and the centrifugal force generated by rotation, which greatly tests the performance and connection performance of the hose. The existing product only provides two syringes for aspirating blood, and during use, the large-capacity syringe is used for injecting whole blood and aspirating the PPP / red blood cell layer, and the small-capacity syringe is used for aspirating and injecting PRP, which does not meet the multi-component separation requirement.

[0005] Therefore, a rotatable platelet-rich plasma preparation device is urgently needed to solve the above problems. UTILITY MODEL CONTENTS

[0006] Based on the above, the purpose of the utility model is to provide a rotatable platelet-rich plasma preparation device with a simple structure and convenient installation, which can meet the multi-component separation requirement.

[0007] To achieve the above purpose, the utility model adopts the following technical solutions:

[0008] The application discloses a rotatable platelet-rich plasma preparation device, which comprises a centrifugal tube, a rotating head and a connecting pipeline.

[0009] As a preferred scheme of the rotatable platelet-rich plasma preparation device, the centrifugal tube comprises a tube body, a liquid collecting part, a connecting part and a ventilation part, a through hole for accommodating the rotating end of the rotating head is arranged in the middle of the tube body, the liquid collecting part is arranged at both ends of the tube body, the connecting part is arranged at the inlet and outlet ends of the liquid collecting part, and the ventilation part is arranged on the tube body.

[0010] As a preferred scheme of the rotatable platelet-rich plasma preparation device, the tube body comprises a left tube body and a right tube body, the liquid collecting part comprises a left liquid collecting part and a right liquid collecting part, the left liquid collecting part is arranged at the left side of the left tube body, the right liquid collecting part is arranged at the right side of the right liquid collecting part, the connecting part comprises a left connecting part and a right connecting part, the left connecting part and the right connecting part are arranged at the inlet and outlet ends of the left liquid collecting part and the right liquid collecting part respectively, the left connecting part is connected with one end of a three-way pipe through a pipeline, the right connecting part is connected with the other end of the three-way pipe through a pipeline, and the third end of the three-way pipe is connected with the other end of the rotating head.

[0011] As a preferred scheme of the rotatable platelet-rich plasma preparation device, the ventilation part is arranged in the middle of the tube body.

[0012] As a preferred scheme of the rotatable platelet-rich plasma preparation device, the liquid collecting part is wholly or partially provided with an inner cavity structure with diameters decreasing from large to small, and the connecting part is fixedly connected to the small-diameter end of the liquid collecting part and is provided with an inner hole in communication with the liquid collecting part.

[0013] As a preferred scheme of the rotatable platelet-rich plasma preparation device, the center axis of the inner hole of the connecting part is coaxial or parallel with the center axis of the tube body.

[0014] As a preferred scheme of the rotatable platelet-rich plasma preparation device, the center axis of the inner hole of the connecting part is perpendicular or provided with a preset angle with the center axis of the tube body.

[0015] As a preferred scheme of the rotatable platelet-rich plasma preparation device, the rotating head comprises a fixed part, a sealed shell, a central pipe, a bearing, a pressing block, a first sealing ring and a second sealing ring, the bearing is sleeved on the central pipe, one end of the bearing abuts against the sealed shell, the other end of the bearing abuts against the pressing block, a first sealing ring is arranged at the lower end of the pressing block for sealing between the pressing block and the sealed shell, and a second sealing ring is further arranged at the upper end of the central pipe for sealing between the central pipe and the sealed shell, and the pressing block, the first sealing ring, the second sealing ring and the sealed shell jointly form a sealed cavity of the central pipe.

[0016] As a preferred scheme of the rotatable platelet-rich plasma preparation device, the fixed part comprises a connecting end, the connecting end is connected with the liquid extraction device through a connecting pipeline, a tee joint and a connector, and the other end of the fixed part extends into the central pipe.

[0017] As a preferred scheme of the rotatable platelet-rich plasma preparation device, the other end of the rotating head is sequentially connected with at least two tee joints, and one end or both ends of the tee joint is respectively connected with the liquid extraction device through the connector.

[0018] As a preferred scheme of the rotatable platelet-rich plasma preparation device, one end of the central pipe, which is away from the connecting end, transversely penetrates the centrifugal pipe and is communicated with the centrifugal pipe through the tee joint.

[0019] As a preferred scheme of the rotatable platelet-rich plasma preparation device, the pressing block is provided with an abutting edge extending towards the radial inner side of the pressing block, and the abutting edge is sleeved on the outer wall of the central pipe.

[0020] As a preferred scheme of the rotatable platelet-rich plasma preparation device, the second sealing ring is arranged at one end of the pressing block, which is away from the bearing, and one end of the second sealing ring abuts against the outer wall of the central pipe, and the other end of the second sealing ring abuts against the side of the pressing block, which is away from the bearing.

[0021] As a preferred scheme of the rotatable platelet-rich plasma preparation device, the side, where the fixed part and the sealed shell are close to each other, is provided with a sealing groove, and the opposite sides of the first sealing ring abut against the groove bottoms of the two sealing grooves.

[0022] As a preferred scheme of the rotatable platelet-rich plasma preparation device, the inner wall of the first sealing ring is provided with a groove, and the pressing block is provided with a sealing flange extending towards the radial outer side of the pressing block, and the sealing flange can abut against the groove bottom of the groove.

[0023] The beneficial effects of the utility model are as follows:

[0024] 1. The rotatable platelet-rich plasma centrifugal preparation device can be rotated, and the center pipe is arranged in the centrifugal tube. During the rotation and centrifugation process, the liquid extraction device remains stationary, greatly simplifying the structure of the centrifugal tube and the connecting pipeline. The stress part of the relative rotation assembly is adjusted to the center pipe with higher strength. The original most vulnerable hose only plays a connecting role after adjustment and is no longer subjected to torsional force, effectively avoiding the failure risk point of the prior art.

[0025] 2. The centrifugal tube of the rotatable platelet-rich plasma centrifugal preparation device is a single-cavity structure, which is simple in structure, easy to assemble, and low in production cost.

[0026] 3. The rotatable platelet-rich plasma centrifugal preparation device can be connected with at least three pipelines and the liquid extraction device to realize classified storage of at least three blood components. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical scheme in the embodiments of the utility model, the drawings needed to be used in the description of the embodiments of the utility model will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained according to the contents of the embodiments of the utility model and these drawings without creative labor for those skilled in the art.

[0028] Figure 1 It is the front view of the rotatable platelet-rich plasma preparation device provided by the specific embodiment of the utility model;

[0029] Figure 2 It is the sectional view of the front view of the rotatable platelet-rich plasma preparation device provided by the specific embodiment of the utility model;

[0030] Figure 3 It is the A part of the utility model. Figure 2

[0031] In the drawing:

[0032] 1, centrifugal tube; 10, through hole; 11, pipe body; 111, left pipe body; 112, right pipe body; 12, liquid collecting part; 121, left liquid collecting part; 122, right liquid collecting part; 13, connecting part; 131, left connecting part; 132, right connecting part; 14, air passage; 2, rotating head; 21, fixed part; 22, center pipe; 23, bearing; 24, pressing block; 241, abutting edge; 242, sealing flange; 25, first sealing ring; 26, second sealing ring; 27, sealing shell; 211, connecting end; 3, tee joint; 4, joint; 5, connecting pipeline. DETAILED DESCRIPTION

[0033] ​The embodiments of the present application are described below in detail, examples of the embodiments are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0034] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application. In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0035] Unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0036] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0037] The technical solutions of the present application are further illustrated below by combining the drawings and through specific embodiments.

[0038] As Figure 1As shown in the utility model one concrete embodiment in rotatable platelet rich plasma centrifugal preparation device includes centrifugal tube 1, rotating head 2 and connecting pipeline 5, the center tube 22 of rotating head 2 is contained in centrifugal tube 1, and the inlet and outlet end of centrifugal tube 1 is connected with the one end of the center tube 22 of rotating head 2 through connecting pipeline 5, and the other end of rotating head 2 is fixedly connected with liquid extraction device (not shown in the drawing) through connecting pipeline 5, and the one end of rotating head 2 provided with center tube 22 can rotate freely relative to the other end of rotating head 2 in the utility model.

[0039] As shown in the utility model one concrete embodiment in rotatable platelet rich plasma centrifugal preparation device includes centrifugal tube 1, rotating head 2 and connecting pipeline 5, the center tube 22 of rotating head 2 is contained in centrifugal tube 1, and the inlet and outlet end of centrifugal tube 1 is connected with the one end of the center tube 22 of rotating head 2 through connecting pipeline 5, and the other end of rotating head 2 is fixedly connected with liquid extraction device (not shown in the drawing) through connecting pipeline 5, and the one end of rotating head 2 provided with center tube 22 can rotate freely relative to the other end of rotating head 2 in the utility model. Figure 1 、 2 As shown in the utility model one concrete embodiment in rotatable platelet rich plasma centrifugal preparation device includes centrifugal tube 1, rotating head 2 and connecting pipeline 5, the center tube 22 of rotating head 2 is contained in centrifugal tube 1, and the inlet and outlet end of centrifugal tube 1 is connected with the one end of the center tube 22 of rotating head 2 through connecting pipeline 5, and the other end of rotating head 2 is fixedly connected with liquid extraction device (not shown in the drawing) through connecting pipeline 5, and the one end of rotating head 2 provided with center tube 22 can rotate freely relative to the other end of rotating head 2 in the utility model.

[0040] As shown in the utility model one concrete embodiment in rotatable platelet rich plasma centrifugal preparation device includes centrifugal tube 1, rotating head 2 and connecting pipeline 5, the center tube 22 of rotating head 2 is contained in centrifugal tube 1, and the inlet and outlet end of centrifugal tube 1 is connected with the one end of the center tube 22 of rotating head 2 through connecting pipeline 5, and the other end of rotating head 2 is fixedly connected with liquid extraction device (not shown in the drawing) through connecting pipeline 5, and the one end of rotating head 2 provided with center tube 22 can rotate freely relative to the other end of rotating head 2 in the utility model.

[0041] As shown in the utility model one concrete embodiment in rotatable platelet rich plasma centrifugal preparation device includes centrifugal tube 1, rotating head 2 and connecting pipeline 5, the center tube 22 of rotating head 2 is contained in centrifugal tube 1, and the inlet and outlet end of centrifugal tube 1 is connected with the one end of the center tube 22 of rotating head 2 through connecting pipeline 5, and the other end of rotating head 2 is fixedly connected with liquid extraction device (not shown in the drawing) through connecting pipeline 5, and the one end of rotating head 2 provided with center tube 22 can rotate freely relative to the other end of rotating head 2 in the utility model.

[0042] As shown in the utility model one concrete embodiment in rotatable platelet rich plasma centrifugal preparation device includes centrifugal tube 1, rotating head 2 and connecting pipeline 5, the center tube 22 of rotating head 2 is contained in centrifugal tube 1, and the inlet and outlet end of centrifugal tube 1 is connected with the one end of the center tube 22 of rotating head 2 through connecting pipeline 5, and the other end of rotating head 2 is fixedly connected with liquid extraction device (not shown in the drawing) through connecting pipeline 5, and the one end of rotating head 2 provided with center tube 22 can rotate freely relative to the other end of rotating head 2 in the utility model.

[0043] As shown in the utility model one concrete embodiment in rotatable platelet rich plasma centrifugal preparation device includes centrifugal tube 1, rotating head 2 and connecting pipeline 5, the center tube 22 of rotating head 2 is contained in centrifugal tube 1, and the inlet and outlet end of centrifugal tube 1 is connected with the one end of the center tube 22 of rotating head 2 through connecting pipeline 5, and the other end of rotating head 2 is fixedly connected with liquid extraction device (not shown in the drawing) through connecting pipeline 5, and the one end of rotating head 2 provided with center tube 22 can rotate freely relative to the other end of rotating head 2 in the utility model.

[0044] Specifically, in this embodiment, the inner hole center axis of the connecting part 13 is coaxial or parallel to the center axis of the tube body 11. The inner hole center axis of the connecting part 13 in this utility model can also be perpendicular to the center axis of the tube body 11 or at other angles.

[0045] like Figure 3 As shown, the rotating head 2 in this embodiment includes a fixing part 21, a central tube 22, a bearing 23, a pressure block 24, a first sealing ring 25, a second sealing ring 26, and a sealing shell 27. The bearing 23 is fitted onto the central tube 22, with one end of the bearing 23 abutting against the sealing shell 27 and the other end abutting against the pressure block 24. The bearing 23 supports the central tube 22 and enables its smooth rotation. The pressure block 24 presses the bearing 23. A first sealing ring 25 is provided at the lower end of the pressure block 24 to achieve a sealed connection between the pressure block 24 and the sealing shell 27. A second sealing ring 26 is also provided at the upper end of the central tube 22 to achieve a sealed connection between the central tube 22, the pressure block 24, and the sealing shell 27. In this embodiment, the pressure block 24, the first sealing ring 25, the second sealing ring 26, and the sealing shell 27 together constitute the sealed cavity of the rotating head 2, preventing the blood flowing through it from being contaminated by the external environment. In this embodiment, the sealing shell 27 includes an upper sealing shell and a lower sealing shell. The upper sealing shell and the lower sealing shell are connected by screws, and the upper sealing shell and the lower sealing shell are sealed by a first sealing ring 25.

[0046] In this embodiment, the fixing part 21 includes a connecting end 211, which is connected to the liquid extraction device through the connecting pipe 5, the tee 3, and the connector 4. The other end of the fixing part 21 extends into the central tube 22.

[0047] Specifically, the other end of the fixing part 21 extends into the end of the central tube 22 near the connecting end 211, and the end of the central tube 22 away from the connecting end 211 passes through the centrifuge tube 1 and is connected to the centrifuge tube 1 through the tee 3. It can be understood that the central tube 22 passes through the centrifuge tube 1 through the through hole 10, so that the fixing part 21 and the tee 3 connected to the centrifuge tube 1 are located on the upper and lower sides of the centrifuge tube 1, respectively. One of the interfaces of the tee 3 connected to the centrifuge tube 1 is connected to the central tube 22, and the other two interfaces are connected to the left connecting part 131 and the right connecting part 132, respectively.

[0048] It is worth noting that the rotating head 2 is positioned close to the centrifuge tube 1 to improve the stability of the rotating head 2 during the rotation of the centrifuge tube 1, thereby improving the reliability of the connection of the rotating head 2 and the conduction of blood components. At the same time, the rotating head 2 is positioned on the outside of the centrifuge tube 1, which helps to simplify the structure of the centrifuge tube 1.

[0049] Further, the side of the pressing block 24 away from the bearing 23 is provided with an abutting edge 241 extending towards the radial inner side thereof, the abutting edge 241 is sleeved on the outer wall of the central pipe 22, and the inner wall of the abutting edge 241 is not in direct contact with the outer wall of the central pipe 22. Correspondingly, the second sealing ring 26 is arranged at the end of the pressing block 24 away from the bearing 23, and one end is in abutment with the outer wall of the central pipe 22, and the other end is in abutment with the side of the pressing block 24 away from the bearing 23, specifically in abutment with the abutting edge 241, for realizing the sealing between the central pipe 22 and the abutting edge 241. The arrangement of the abutting edge 241 can improve the sealing effect of the second sealing ring 26 and improve the reliability of the sealing.

[0050] In the embodiment, to realize the sealing between the first sealing ring 25 and the fixed part 21 and the sealing shell 27, the side of the fixed part 21 and the sealing shell 27 close to each other is provided with a sealing groove, and when the fixed part 21 and the sealing shell 27 are buckled, the opposite sides of the first sealing ring 25 are respectively in abutment with the groove bottoms of the two sealing grooves.

[0051] Further, to realize the sealing between the first sealing ring 25 and the pressing block 24, the inner wall of the first sealing ring 25 is provided with a groove, and the pressing block 24 is provided with a sealing flange 242 extending towards the radial outer side thereof, and the sealing flange 242 can be in abutment with the groove bottom of the groove.

[0052] In use, the centrifugal tube 1 is fixedly installed on the entire device of the centrifugal equipment. Since the rotating head 2 is provided, the centrifugal tube 1 connected with the central pipe 22 at one end of the rotating head 2 and the connecting pipeline 5 are rotated for centrifugation, and the other end of the rotating head 2 is connected with the liquid extraction device to remain stationary. The rotating head 2 plays a role of connection and flow guide while realizing that the two pipeline ends can relatively rotate to meet the requirement of rotary centrifugation. Since the central pipe 22 of the rotating head 2 is built-in in the centrifugal tube 1, the central pipe 22 and the centrifugal tube 1 are rigidly connected, which greatly simplifies the structure of the pipeline. The force bearing part of the relative rotating assembly is adjusted to the central pipe 22 with higher strength, and the originally most likely to fail hose only plays a role of connection after adjustment and is no longer subjected to torsional force, thereby effectively avoiding the failure risk point of the prior art.

[0053] In the embodiment, one end of the rotating head 2 is connected with one end of the tee joint 3, the other end of the tee joint 3 is connected with the joint 4 and the liquid extraction device through the connecting pipeline 5, the third end of the tee joint 3 is connected with one end of another tee joint 3 through the connecting pipeline 5, the other end of the other tee joint 3 is connected with another joint 4 and another liquid extraction device through the connecting pipeline 5, and the third end of the tee joint 3 is connected with still another joint 4 and still another liquid extraction device through the connecting pipeline 5. According to actual application requirements, the utility model can also be provided with a fourth tee joint 3, a fifth tee joint 3, or even more tee joints 3 to connect a fourth liquid extraction device, a fifth liquid extraction device, or even more liquid extraction devices to realize the classified storage of at least three blood components.

[0054] Specifically, the liquid extraction device is a medical syringe, the connector 4 is a standard luer connector, and the connecting pipeline 5 is a transparent flexible tube.

[0055] The above is only a preferred embodiment of the present application, and for those skilled in the art, according to the idea of the present application, the specific implementation and application range will be changed, and the content of the specification should not be understood as a limitation of the present application.

Claims

1. A rotatable platelet-rich plasma preparation device, characterized by, The centrifugal tube, the rotating head and the connecting pipeline are included, the rotating end of the rotating head is connected with the inlet and outlet end of the centrifugal tube through the connecting pipeline after crossing the centrifugal tube, and the fixed end of the rotating head is connected with the liquid extraction device through the connecting pipeline.

2. The rotatable platelet-rich plasma preparation device of claim 1, wherein, The centrifugal tube includes a tube body, a liquid collecting part, a connecting part and a venting part, a through hole for accommodating the rotating end of the rotating head is arranged in the middle of the tube body, the liquid collecting part is arranged at both ends of the tube body, the connecting part is arranged at the inlet and outlet end of the liquid collecting part, and the venting part is arranged on the tube body.

3. The rotatable platelet-rich plasma preparation device of claim 2, wherein, The tube body includes a left tube body and a right tube body, the liquid collecting part includes a left liquid collecting part and a right liquid collecting part, the left liquid collecting part is arranged at the left side of the left tube body, the right liquid collecting part is arranged at the right side of the right tube body, the connecting part includes a left connecting part and a right connecting part, the left connecting part and the right connecting part are arranged at the inlet and outlet end of the left liquid collecting part and the right liquid collecting part respectively, the left connecting part is connected with one end of a three-way joint through a pipeline, the right connecting part is connected with the other end of the three-way joint through a pipeline, and the third end of the three-way joint is connected with the other end of the rotating head.

4. The rotatable platelet-rich plasma preparation device of claim 2, wherein, The venting part is arranged in the middle of the tube body.

5. The rotatable platelet-rich plasma preparation device of claim 2, wherein the rotatable platelet-rich plasma preparation device further comprises a second rotatable platelet-rich plasma preparation device. The liquid collecting part is all or partially an inner cavity structure with diameters decreasing from large to small, the connecting part is fixedly connected with the small-diameter end of the liquid collecting part and is provided with an inner hole in communication with the liquid collecting part.

6. The rotatable platelet-rich plasma preparation device of claim 2, wherein, The center axis of the inner hole of the connecting part is coaxial or parallel with the center axis of the tube body.

7. The rotatable platelet-rich plasma preparation device of claim 2, wherein, The center axis of the inner hole of the connecting part is perpendicular or at a preset angle with the center axis of the tube body.

8. The rotatable platelet-rich plasma preparation device of claim 1, wherein, The rotating head includes a fixed part, a sealing shell, a center tube, a bearing, a pressing block, a first sealing ring and a second sealing ring, the bearing is sleeved on the center tube, one end of the bearing abuts against the sealing shell, the other end of the bearing abuts against the pressing block, a first sealing ring is arranged at the lower end of the pressing block for sealing between the pressing block and the sealing shell, and a second sealing ring is arranged at the upper end of the center tube for sealing between the center tube and the sealing shell, and the pressing block, the first sealing ring, the second sealing ring and the sealing shell jointly form a sealing cavity of the center tube.

9. The rotatable platelet-rich plasma preparation device of claim 8, wherein, The fixed part includes a connecting end connected with the liquid extraction device through a connecting pipeline, a three-way joint and a joint, and the other end of the fixed part extends into the center tube.

10. The rotatable platelet-rich plasma preparation device of claim 9, wherein, The other end of the rotating head is sequentially connected with at least two three-way joints, one end or both ends of the three-way joints are respectively connected with the liquid extraction device through the joint.

11. The rotatable platelet-rich plasma preparation device of claim 9, wherein, One end of the center tube away from the connecting end crosses the centrifugal tube and is connected with the centrifugal tube through the three-way joint.

12. The rotatable platelet-rich plasma preparation device of claim 8, wherein, The pressing block is provided with an abutting edge extending towards the radial inner side thereof, and the abutting edge is sleeved on the outer wall of the center tube.

13. The rotatable platelet-rich plasma preparation device of claim 12, wherein, The second sealing ring is arranged at the end of the pressing block away from the bearing, and one end of the second sealing ring abuts against the outer wall of the center tube and the other end abuts against the side of the pressing block away from the bearing.

14. The rotatable platelet-rich plasma preparation device of claim 8, wherein, The side of the fixed part and the sealing shell close to each other is provided with a sealing groove, and the opposite sides of the first sealing ring abut against the groove bottoms of the two sealing grooves.

15. The rotatable platelet-rich plasma preparation device of claim 8, wherein, The inner wall of the first sealing ring is provided with a groove, and the pressing block is provided with a sealing flange extending towards the radial outer side thereof, and the sealing flange can abut against the groove bottom of the groove.

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