CN220328975U

CN220328975U - Platelet separator and platelet recovery device

Info

Publication number: CN220328975U
Application number: CN202321315056.7U
Authority: CN
Inventors: 张志敏; 张�杰; 李云芳; 王凯旋
Original assignee: Beijing Chunlizhengda Medical Instruments Co Ltd
Current assignee: Beijing Chunlizhengda Medical Instruments Co Ltd
Priority date: 2023-05-29
Filing date: 2023-05-29
Publication date: 2024-01-12
Anticipated expiration: 2033-05-29

Abstract

The utility model discloses a platelet separator and a platelet recovery device, and belongs to the technical field of medical supplies. It comprises an upper cylinder and a lower cylinder; the lower cylinder is in threaded connection with the adjacent end of the upper cylinder; the other ends of the upper cylinder and the lower cylinder are respectively provided with a sealing cap; the device also comprises a driving piece and a control part; a baffle plate is arranged in the middle of the upper cylinder and is perpendicular to the central axis of the upper cylinder; the center of the partition board is also provided with a first communication hole; the middle position of the lower cylinder is contracted to form a second communication hole; the control part comprises an upper stop rod, a lower stop rod and a connecting piece; the upper stop rod and the lower stop rod are fixed on the same central axis through a connecting piece, a strip opening is formed in the lower cylinder, the connecting piece penetrates through the strip opening and is embedded in an annular groove in the inner wall of the pipe fitting, and the connecting piece has a degree of freedom of rotation around the connecting piece on the annular groove. The utility model has the advantages of more convenient use, easy control and the like.

Description

Platelet separator and platelet recovery device

Technical Field

The utility model relates to the technical field of medical supplies, in particular to a platelet separator and a platelet recovery device.

Background

In general, body fluid refers to fluids in the body such as blood, lymph fluid, and tissue fluid. Wherein blood (blood) can be largely divided into blood cells as a solid component and plasma as a liquid component. The blood cells are formed of red blood cells, white blood cells and platelets, and the plasma is mainly formed of moisture, which contains blood coagulation factors and electrolytes necessary for life support, and the like. Such blood is widely used as a mixture of various components, and for various medical purposes, a process of extracting a specific component by separating blood is widely used. Wherein the desired components can be separated for therapeutic purposes by a blood centrifugation process of a centrifuge and a process using a specific composition. In the step of separating blood by centrifugal separation, the blood is centrifuged at a high speed at a predetermined speed, and the layer separation is performed by utilizing the weight difference of each component in the blood, so that the heaviest red blood cells form a lower layer, and a separation layer is formed in the order of white blood cells, plasma, and serum from the lower layer in the height direction toward the upper portion.

At present, the storage and separation of different body fluids in the centrifugal process are mostly completed through a separator, different baffle rods are used for separating the centrifuged blood in a threaded rotation mode, the separator in the prior art needs to operate a plurality of different parts in the use process, and the rotation direction cannot be limited, so that the different directions are easy to twist by mistake and wrong in the operation process, the centrifuged blood is mixed again together, and the waste of the body fluids is caused, and therefore, a platelet separation and platelet recovery device is urgently needed to solve the problem.

The utility model aims to solve the problems that: the utility model provides a platelet's separator and platelet's recovery unit, solves prior art's separator and need operate a plurality of different parts in the use, and the direction of rotation can not control, and the operation is inconvenient. Thus being easy to be wrongly twisted and twisted in different directions in the operation process.

Disclosure of Invention

The utility model aims to provide a platelet separator and a platelet recovery device, which have the advantages of more convenient use, easy control and the like.

In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

a platelet separator comprises an upper cylinder and a lower cylinder; the lower cylinder is in threaded connection with the adjacent end of the upper cylinder; the other ends of the upper cylinder and the lower cylinder are respectively provided with a sealing cap; the device also comprises a driving piece and a control part;

a baffle plate is arranged in the middle of the upper cylinder and is perpendicular to the central axis of the upper cylinder; the center of the partition board is also provided with a first communication hole;

the middle position of the lower cylinder is contracted to form a second communication hole;

the driving piece comprises a pipe fitting 9 which is positioned on the outer side of the lower cylinder and is in threaded connection with the outer wall of the lower cylinder;

the control part comprises an upper stop rod, a lower stop rod and a connecting piece; the upper stop rod and the lower stop rod are fixed on the same central axis through a connecting piece, and the upper stop rod and the lower stop rod can be selectively connected or blocked by shifting towards the same direction;

the lower cylinder is provided with a strip opening, the connecting piece penetrates through the strip opening and is embedded in an annular groove on the inner wall of the pipe fitting, and the connecting piece has a degree of freedom of rotation around the connecting piece on the annular groove;

the driving piece further comprises an elastic clamping piece, and the elastic clamping piece is positioned at the inner side of the pipe fitting; and a plurality of groups of limiting holes are formed in the outer wall of the lower cylinder, and the elastic clamping piece is matched with the limiting holes and used for locking and positioning.

Further, at least two annular sealing gaskets are arranged on the inner wall of the pipe fitting, and the two annular sealing gaskets are respectively positioned on the upper side and the lower side of the strip opening.

Further, the connecting piece is of a cross structure and comprises a vertical rod and a horizontal rod, two ends of the vertical rod are respectively connected with the upper stop rod and the lower stop rod, and two ends of the horizontal rod respectively penetrate through corresponding strip openings and are restrained on the annular groove of the pipe fitting.

Further, the upper stop rod comprises two stop blocks and a vertical rod, the two stop blocks are fixedly connected through the vertical rod, the diameter of the vertical rod is smaller than that of the stop blocks, and the height of the vertical rod is larger than that of the first communication hole.

Further, the elastic clamping piece is formed by fixing a clamping block at the tail end of the elastic vertical rod, an inclined plane is arranged on one side of the clamping block, the vertical rod and the clamping block are integrally formed, and a notch for accommodating the elastic clamping piece is formed in the side wall of the pipe fitting.

Further, when the elastic clamping piece is sequentially clamped in the plurality of groups of limiting holes, the lower stop rod is closed to the second communication hole and the upper stop rod is opened to the first communication hole when the elastic clamping piece is clamped in the first limiting holes; when the lower stop rod is clamped into the second limiting hole, the lower stop rod is closed to the second communication hole, and the upper stop rod is closed to the first communication hole.

Further, the upper cylinder is communicated with a filtering port for injecting body fluid, the filtering port is a circular tube with a filter tip at one end, the circular tube is combined with the upper cylinder in one of an ultrasonic welding mode and a screw fastening mode, and an elastic baffle is assembled in the circular tube.

Further, the sealing cap on the upper cylinder comprises an annular clung body 31 and clung plates 32, and the annular clung body is in threaded connection with the upper cylinder; the clinging plate is made of rubber material and is matched with the central hole of the annular clinging body to realize sealing.

The platelet recovery device of the platelet separator comprises the platelet separator, a collecting cylinder and a tube body with injection needles at two ends, wherein the inside of the collecting cylinder is in vacuum arrangement, and the end part of the collecting cylinder is provided with a flexible part; the injection needles at the two ends of the tube body are used for being inserted into the flexible part and the sealing cap of the collecting cylinder.

The utility model has the beneficial effects that:

according to the utility model, through the arranged pipe fitting, the elastic clamping piece and the two stop rods, the blood separation operation can be completed by only twisting the pipe fitting, and meanwhile, the pipe fitting can only be twisted in one direction by using the limiting function, so that wrong twisting and wrong twisting directions can not occur, the stability of blood separation is ensured, and the mixing phenomenon can not occur.

Drawings

FIG. 1 is a schematic view showing the structure of an initial state of a platelet separator;

FIG. 2 is a schematic diagram of the structure of a minor state of a platelet separator;

FIG. 3 is a schematic diagram of the final state of a platelet separator;

FIG. 4 is a schematic view of the pipe fitting and annular groove of FIG. 1;

fig. 5 is a schematic view showing a state of use of the platelet recovery device of the platelet separator.

In the figure: 1. an upper cylinder housing; 2. a lower cylinder housing; 3. a sealing cap; 4. a partition plate; 5. a partition wall; 6. an upper stop lever; 7. a lower stop lever; 8. a connecting piece; 9. a pipe fitting; 10. an elastic clamping piece; 11. a sealing gasket; 12. a filtering port; 13. an elastic baffle; 14. a collection canister; 15. an annular groove body; 16. a tube body.

Detailed Description

The following description of embodiments of the present utility model will be made more fully hereinafter with reference to the accompanying drawings and examples, in which embodiments, however, are shown in the drawings, in which embodiments of the utility model are shown, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

The utility model is further described with reference to the following detailed drawings in order to make the technical means, the creation characteristics, the achievement of the objects and the effects of the utility model easy to understand. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

As shown in fig. 1 to 4, the device comprises an upper cylinder housing 1, a lower cylinder housing 2, a sealing cap 3 for closing one end of the upper cylinder housing 1 and one end of the lower cylinder housing 2, and a control part, wherein a first centrifugal separation process and a second centrifugal separation process are sequentially performed on a liquid such as blood by using a centrifuge, and only a specific component can be selected finally after multi-layer separation of components contained in the blood as a body fluid according to a specific gravity difference.

The sealing cap 3 comprises an annular clinging body 31, a clinging plate 32 is arranged in one end of the annular clinging body, the annular clinging body is elastically matched with the outside of the upper cylinder shell 1 or the lower cylinder shell 2, and can be displaced along the length direction relative to the upper cylinder shell 1 and the lower cylinder shell 2, the clinging plate is arranged in the upper cylinder shell 1 or the lower cylinder shell 2, the annular clinging body and the clinging plate can be integrally formed or detachably assembled, internal threads formed through the inner peripheral surface of the sealing cap 3 are mutually combined with external threads formed through the outer peripheral surfaces of the upper cylinder shell 1 and the lower cylinder shell 2, so that the rotary sealing cap 3 can move up and down, and the height of blood between the first communication hole and the second communication hole can be adjusted, and the blood can be separated better.

In the sealing cap 3 at the tip, a central hole is formed by penetrating the bottom surface recessed by a predetermined depth on the central upper surface of the annular contact body, and a contact plate made of a rubber material or the like is provided in the central hole, so that the sealing is performed by being combined with one end of the opening of the upper cylinder case 1, and the contact plate can move synchronously with the main body, thereby facilitating the subsequent recognition of the difference between the sealing caps 3 at the both ends.

In the sealing cap 3 of lower extreme, the body is hugged closely with hugging closely the board integrated into one piece, hugs closely the board simultaneously and is the arch setting towards the one end of lower drum shell 2, can make the blood of follow-up first communication hole below squeeze down the flitch through arched setting under the effect of pressure, makes it take place deformation, and then increase accommodation space.

The upper cylinder housing 1 and the lower cylinder housing 2 are formed by hollow cylinder members, wherein the outer circumferential surface of the open end of the hollow cylinder members is provided with external screw thread parts to be mutually combined with internal screw thread parts formed in the inner circumference of the top end sealing cap 3, so that the sealing cap 3 moves up and down on the upper cylinder housing 1.

The upper cylindrical housing 1 is formed with a partition plate 4 penetrating a center of a main body to form a first communication hole, and the partition plate 4 may be formed of a substantially disk-shaped plate body extending from an inner surface of the upper cylindrical housing 1 toward a center direction, and a body fluid flow may be more preferably performed by an inclined surface of the plate body to form an upper and lower isolated space.

The upper cylinder shell 1 is communicated with a filtering port 12 for injecting body fluid, the filtering port 12 is a circular tube 122 with one end provided with a filter tip 121, the circular tube 122 is mutually combined with the upper cylinder shell 1 in one of an ultrasonic deposition mode and a screw fastening mode, an elastic baffle 13 is assembled in the circular tube 122, a needle is pricked into the elastic baffle 13 during body fluid injection, and then the needle extends into another space, foreign matters in body fluid can be injected through the filter tip 121 at the moment, and the quality of a subsequent separated product is improved.

Preferably, the angle of the needle head insertion is 45-60 degrees, after the needle head is pulled away from the elastic baffle 13 through the elastic baffle 13, the elastic force of the needle head can be extruded towards the center, so that the hole caused by the needle head is closed, and the opening of the circular tube 122 is further closed, and due to the arrangement of the angle, body fluid is effectively limited to overflow in the centrifugal process.

When the body fluid is bone marrow, the foreign matter filtered by the filter may be bone fragments contained in collecting bone marrow.

The lower cylinder housing 2 is provided with a partition wall 5 penetrating the lower cylinder housing 2 to form a second communication hole, and the lower cylinder housing 2 is provided with the second communication hole in the main body so as to be arranged on the same vertical axis as the first communication hole, and after the body fluid is centrifuged, the components of the blood in the body fluid can be separated above and below the second communication hole according to the specific gravity, thereby realizing the purpose of separating the body fluid.

The control part comprises an upper stop rod 6, a lower stop rod 7 and a driving piece, wherein the upper stop rod 6 and the lower stop rod 7 are combined with each other through a connecting piece 8, the initial state of the upper stop rod 6 is that a first communication hole is closed, and the initial state of the lower stop rod 7 is that a second communication hole is opened. When the connecting piece 8 moves towards the direction of the lower stop rod 7, the lower stop rod 7 can be made to close the second communication hole on the lower cylinder shell 2, and the upper stop rod 6 can be made to open the first communication hole at the moment; when the connecting piece 8 moves next, the lower stop rod 7 continuously closes the second communication hole, and the upper stop rod 6 closes the first communication hole, so that the body fluid and different blood are separated from each other.

Preferably, the upper stop rod 6 includes two stop blocks 61 and a vertical rod 62, two stop blocks 61 are fixedly connected through the vertical rod 62, the diameter of the vertical rod 62 is smaller than that of the stop block 61, the height of the vertical rod is larger than that of the first communication hole, after the lower stop block 61 moves out of the first communication hole downwards, the vertical rod 62 is located between the first communication holes, and the two stop blocks 61 are located on the upper side and the lower side of the first communication hole, so that the first communication hole is in an open state, and the purpose of body fluid inlet and outlet is achieved.

The driving piece is disposed outside the lower cylinder housing 2 in a displacement-limiting manner, and is combined with the connecting piece 8 by providing a strip opening on the lower cylinder housing 2, the driving piece comprises a movable pipe fitting 9 and an elastic clamping piece 10, the pipe fitting 9 is movably sleeved outside the lower cylinder housing 2, and an internal thread formed inside the top end of the pipe fitting 9 is combined with an external thread formed outside the top end of the lower cylinder housing 2, so that the pipe fitting 9 can move up and down in the rotating process.

The elastic clamping piece 10 is formed by fixing the clamping block 102 at the end part of the vertical rod 101 with elasticity, an inclined plane is arranged on one side of the clamping block 102, the vertical rod 101 and the clamping block 102 are integrally formed, a notch for accommodating the vertical rod 101 is formed in the side wall of the pipe fitting 9, one end of the vertical rod 101, which is not fixed with the clamping block 102, is integrally formed in the notch, so that the fluctuation elastic rod can deform in the notch, a plurality of groups of limiting holes are formed in the outer side of the lower cylinder shell 2 and are used for clamping the clamping block 102, when the pipe fitting 9 rotates and moves in a threaded mode, the clamping block 102 can be sequentially clamped in the plurality of groups of limiting holes, meanwhile, the inclined plane is contacted with the limiting holes through the inclined plane arranged on one side of the clamping block 102 when the pipe fitting 9 rotates and moves downwards, automatic deformation of the vertical rod 101 is realized, and when the pipe fitting 9 rotates upwards, the limiting effect of the clamping block 102 and the limiting holes is effective, so that the purpose of moving upwards can not be realized, and the purpose of unidirectional movement of the pipe fitting 9 is realized.

The inner side of the pipe fitting 9 is also provided with an annular groove body 15 for linking the movement and rotation of the connecting piece 8, and two ends of the connecting piece 8 slide in the annular groove body 15, so that the connecting piece 8 can rotate in the annular groove body 15 in the rotating process of the pipe fitting 9, and meanwhile, the pipe fitting 9 links the connecting piece 8 to move in a strip opening.

Preferably, the connecting piece 8 is divided into a vertical end 81 and a horizontal end 82, the horizontal end 82 can be inserted into a strip opening of the lower cylinder shell 2 and clamped in the annular groove body 15, and the vertical end 81 and the horizontal end 82 are detachably connected in a threaded manner, so that the vertical end 81 and the horizontal end 82 can be assembled freely.

The two symmetrical strip openings are arranged on the lower cylinder shell 2, and the end parts of the connecting piece 8 penetrate out of the strip openings and are combined with the driving piece, so that the two end parts of the horizontal part of the connecting piece 8 can be positioned in the annular groove body 15, the connecting piece 8 is stressed uniformly, and the moving stability of the connecting piece 8 is ensured.

Wherein, the inside of pipe fitting 9 is provided with sealed pad 11, is used for filling the clearance between pipe fitting 9 and the above-mentioned lower drum shell 2 when pipe fitting 9 moves, and sealed pad 11 can be continuously filled and can produce the position in clearance, and then makes the liquid in the lower drum shell 2 can not take place to spill over.

When the elastic clamping member 10 is sequentially clamped in the plurality of groups of limiting holes, the lower stop rod 7 closes the second communication hole and enables the upper stop rod 6 to open the first communication hole when being clamped in the first limiting hole, and the lower stop rod 7 continues to close the second communication hole when being clamped in the second limiting hole, so that the upper stop rod 6 closes the first communication hole and further various blood in body fluid are separated from each other.

As shown in fig. 5, a platelet recovery device of a platelet separator comprises the platelet separator, a collection tube 14 and a tube 16 with injection needles at two ends, wherein the interior of the collection tube 14 is in vacuum arrangement, and the end part is provided with a flexible part;

the injection needles at two ends of the tube body 16 are inserted into the flexible part of the collecting barrel 14 and the sealing cap 3, and are used for communicating the pipe fitting 9 with the upper cylinder shell 1, firstly, the injection needle at one end of the tube body 16 is inserted into the sealing cap 3 to be communicated with the space in the sealing cap 3, secondly, the injection needle at the other end is inserted into the tube body 16 to be communicated, and platelets can be recovered and stored through negative pressure in the tube body 16, so that the blood platelet collecting device is convenient and quick.

The procedure of performing centrifugal separation twice on a body fluid such as bone marrow or blood, which is a subject to be centrifugal separation, using the example having the above-described configuration is described below.

First, as shown in the figure, by inserting the needle head of the injection needle into the elastic barrier 13 and then extending into another space, the injection of body fluid can be performed to foreign matters in the body fluid through the filter 121, and the injected body fluid is stored in the lower cylinder housing 2 and deposited on the sealing cap 3 below.

Meanwhile, after the needle is pulled away from the elastic baffle 13, the elastic force of the needle can extrude towards the center, so that the hole caused by the needle is closed, and the opening of the circular tube 122 is further closed, and due to the arrangement of the angle, body fluid is effectively limited to overflow in the centrifugal process.

After the body fluid injection operation by the syringe is completed, a step of performing a first centrifugation of the body fluid by a centrifuge is performed, and when the first centrifugation is completed, the blood cell component C and the plasma component P contained in the body fluid as the centrifugally separated bone marrow may be separated in the up-down direction according to a difference in specific gravity, and a boundary layer between the blood cell component C and the plasma component P stacked in the up-down direction according to the difference in specific gravity may be formed at an upper side or a lower side of the second communication hole according to an amount of centrifugal separation.

At this time, the separator is taken out, the pipe fitting 9 is screwed to rotate, and then the annular groove body 15 is arranged, so that the connecting piece 8 can be driven to move downwards by the rotation of the pipe fitting 9, and then the lower stop rod 7 seals the second communication hole, so that the boundary layer between the blood cell component C and the plasma component P is positioned at the upper end of the second communication hole.

At this time, the clamping blocks 102 are sequentially clamped in the second limiting holes, and simultaneously, through the inclined surface arranged on one side of the clamping blocks 102, the inclined surface is enabled to be in contact with the limiting holes when the pipe fitting 9 rotates to move downwards, so that automatic deformation of the vertical rod 101 is realized, and when the pipe fitting 9 moves upwards in a rotating mode, the limiting effect of the clamping blocks 102 and the limiting holes takes effect, so that the aim of upward movement cannot be realized, the aim of unidirectional movement of the pipe fitting 9 is realized, the rollback work of the lower stop rod 7 is not caused, and the separation stability is ensured.

Next, the separator is rotated by 180 ° at the center, and the step of performing the centrifugal separation of the body fluid by the centrifugal separator for the second time is continued, and after the second centrifugal separation, the plasma component is separated up and down into a platelet-rich plasma layer P1 as platelet-concentrated plasma and a platelet-poor plasma layer P2 as platelet-poor plasma according to the difference in specific gravity.

At this time, the separator is taken out, the pipe fitting 9 is continuously screwed in the same direction to rotate, and then the annular groove body 15 is arranged, so that the pipe fitting 9 can rotate to drive the connecting piece 8 to move downwards, and then the upper stop rod 6 seals the first communicating hole, so that the boundary layers of the platelet-rich plasma layer P1 and the platelet-poor plasma layer P2 are positioned at the end part of the first communicating hole.

At this time, the clamping blocks 102 are sequentially clamped in the third limiting holes, and then when the pipe fitting 9 rotates upwards, the limiting effect of the clamping blocks 102 and the limiting holes takes effect, so that the purpose of upward movement cannot be achieved, the purpose of unidirectional movement of the pipe fitting 9 is achieved, the rollback work of the lower stop rod 7 cannot be caused, the separation stability is ensured, meanwhile, the operation errors cannot occur, the platelet-rich plasma layer P1, the platelet-poor plasma layer P2 and the blood cell component C are mixed together again, and the waste of test body fluid is further caused.

Finally, the injection needle at one end of the tube body 16 is inserted into the sealing cap 3 to be communicated with the space in the sealing cap 3, and then the injection needle at the other end is inserted into the tube body 16 to be communicated, and the liquid of the platelet-rich plasma layer P1 can be recovered and stored through the negative pressure in the tube body 16, so that the device is convenient and quick.

The foregoing has outlined and described the basic principles and main features of the utility model and the advantages of the utility model. It will be appreciated by persons skilled in the art that the utility model is not limited to the embodiments described above, but that various changes and modifications may be made without departing from the spirit and scope of the utility model, which changes and modifications fall within the scope of the claimed utility model. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims

1. A platelet separator comprises an upper cylinder and a lower cylinder; the lower cylinder is in threaded connection with the adjacent end of the upper cylinder; the other ends of the upper cylinder and the lower cylinder are respectively provided with a sealing cap; the device is characterized by further comprising a driving piece and a control part;

the driving piece comprises a pipe fitting (9) which is positioned on the outer side of the lower cylinder and is in threaded connection with the outer wall of the lower cylinder;

2. A platelet separator as in claim 1 wherein the inner wall of the tube is provided with at least two annular seals located on the upper and lower sides of the slit.

3. The platelet separator according to claim 1, wherein the connecting member has a cross-shaped structure, and comprises a vertical rod and a horizontal rod, wherein both ends of the vertical rod are respectively connected with the upper stop rod and the lower stop rod, and both ends of the horizontal rod respectively pass through the corresponding strip openings to be restrained on the annular groove of the pipe fitting.

4. The platelet separator of claim 1, wherein the upper stopper rod comprises two stoppers and a vertical rod, the two stoppers are fixedly connected through the vertical rod, the diameter of the vertical rod is smaller than that of the stoppers, and the height of the vertical rod is larger than that of the first communicating hole.

5. The platelet separator according to claim 1, wherein the elastic clamping member is formed by fixing a clamping block at the end of the elastic vertical rod, an inclined surface is arranged on one side of the clamping block, the vertical rod and the clamping block are integrally formed, and a notch for accommodating the elastic clamping member is formed in the side wall of the pipe fitting.

6. The platelet separator of claim 4, wherein the elastic clip is sequentially clipped into the plurality of groups of limiting holes, and when clipped into the first limiting hole, the lower stop rod is closed to the second communication hole, and the upper stop rod is opened to the first communication hole; when the lower stop rod is clamped into the second limiting hole, the lower stop rod is closed to the second communication hole, and the upper stop rod is closed to the first communication hole.

7. The platelet separator according to claim 1, wherein the upper cylinder is connected with a filtering port for injecting body fluid, the filtering port is a circular tube with a filter tip at one end, the circular tube is combined with the upper cylinder in one of an ultrasonic welding mode and a screw fastening mode, and an elastic baffle is assembled in the circular tube.

8. A platelet separator according to claim 1, wherein the sealing cap on the upper cylinder comprises an annular abutment (31) and an abutment plate (32), said annular abutment being threadedly connected to the upper cylinder; the clinging plate is made of rubber material and is matched with the central hole of the annular clinging body to realize sealing.

9. A platelet recovery device of a platelet separator, comprising a platelet separator according to any one of claims 1 to 8, characterized by further comprising a collection tube and a tube with injection needles at both ends, wherein the interior of the collection tube is arranged in vacuum, and the end is provided with a flexible part; the injection needles at the two ends of the tube body are used for being inserted into the flexible part and the sealing cap of the collecting cylinder.