Apparatus for extracting platelet concentrate for blood centrifugation

Abstract

The present invention relates to a platelet concentrate extraction device for blood centrifugation, and more specifically, to a platelet concentrate extraction device for blood centrifugation comprising: a container body part including an upper chamber for receiving collected blood after centrifugation and a lower chamber communicating with the lower part of the upper chamber; a lifting part disposed in the lower chamber to raise and lower a platelet layer by adjusting the position of a buffy coat layer according to the height of a red blood cell layer stored in the upper chamber; and an extraction part provided in the upper opening of the upper chamber to separate and extract the platelet layer that is gathered at the upper part of the upper chamber.

Description

Technology Field

[0001] The present invention relates to a platelet concentrate extraction device for blood centrifugation, and more specifically, to a platelet concentrate extraction device for blood centrifugation that can extract highly concentrated platelets by rotating a lower cap to raise a compression plate to an extraction section provided at the top of an upper chamber, collecting platelets in a receiving section, and separating them from red blood cells and a buffy coat layer. Background Technology

[0002] PRP is blood obtained by centrifuging a patient's own blood to remove red blood cells and separate the buffy coat layer, which is rich in platelets and growth factors; it is highly concentrated with platelets and growth factors. Since PRP inherently possesses the function of rebuilding and regenerating damaged areas within blood vessels, it is used as a promoter to accelerate skin regeneration or tissue regeneration—similar to proliferative therapy—by highly concentrating growth factors. Because it rebuilds and regenerates skin and tissues (ligaments, tendons), it is effective for conditions such as arthritis, chronic lower back pain, pelvic pain, and injuries to shoulder or knee ligaments. In such cases, it demonstrates superior tissue regeneration capabilities compared to conventional prolotherapy, exhibiting rapid healing power, and carries fewer side effects or infections due to the use of the patient's own blood.

[0003] The conventional PRP extraction method uses a tubular test tube and is carried out by the following steps. Blood collected from the human body is injected into a tubular test tube (80), and the test tube containing the injected blood is centrifuged using a centrifuge. Once centrifugation is completed, red blood cells descend to the bottom of the test tube, and plasma is located above the red blood cells. Next, the needle of a syringe is inserted into the test tube to aspirate and extract the plasma located above the red blood cells. Next, the extracted plasma is centrifuged once more, causing PRP to collect at the very bottom of the test tube, and the remaining portion of plasma containing platelet-poor plasma (hereinafter abbreviated as 'PPP') collects above the PRP. Afterward, the remaining portion of plasma containing PPP located at the top of the test tube is aspirated using a syringe and expelled from the test tube, and the PRP remaining in the test tube is extracted using a new syringe.

[0004] PRP extraction using such conventional tubular test tubes has several disadvantages.

[0005] First, when extracting plasma separated from red blood cells, only the plasma up to a certain distance from the boundary with the red blood cells is extracted to prevent the red blood cells from being sucked into the syringe; the plasma at the boundary cannot be extracted because the red blood cells could be sucked along with it. Consequently, a large amount of plasma is discarded without extraction.

[0006] Second, when extracting PRP by centrifuging plasma, PPP must be aspirated and expelled first, but it is difficult to accurately separate PPP and PRP in the boundary layer between PRP and PPP.

[0007] Third, the buffy coat (white blood cell layer) usually accounts for about 0.1% of blood, so it is very small and difficult to detect in a tubular test tube. Furthermore, even if the buffy coat is detected, it is difficult to separate and extract it from red blood cells. Prior art literature

[0008] Republic of Korea Published Patent No. 10-2011-0009651 (Published Jan. 28, 2011) The problem to be solved

[0009] The present invention provides a platelet concentrate extraction device for blood centrifugation with a novel structure capable of extracting highly concentrated platelets by rotating a lower cap to raise a compression plate toward an extraction section provided at the top of an upper chamber in order to solve the problems of the prior art as described above, thereby collecting the platelet layer into a receiving section and separating it from red blood cells and a buffy coat layer.

[0010] In addition, the invention provides a platelet concentrate extraction device for blood centrifugation in which, when a female helical shaft connected to a lower cam is rotated in one direction, a male helical cylinder helically coupled inside the female helical shaft is raised and lowered, and a compression plate coupled to the male helical cylinder raises and lowers the blood.

[0011] In addition, the invention provides a platelet concentrate extraction device for blood centrifugation that prevents blood leakage or the ingress of external contaminants by forming a sealing projection along the outer surface of the packing portion surrounding the compression plate to seal the space between the compression plate and the inner surface of the container body.

[0012] In addition, when the buffy coat layer and plasma are adjacent to a funnel-shaped receiving portion, the receiving portion is lowered to collect and compress the platelet layer inwardly, thereby providing a platelet concentrate extraction device for blood centrifugation.

[0013] In addition, the invention provides a platelet concentrate extraction device for blood centrifugation that is equipped with a lower extraction unit communicating with a lower cap to first extract a platelet layer, extract red blood cells from the remaining blood into the lower extraction unit, and then further centrifuge the remaining blood in the upper chamber to extract more concentrated platelets. means of solving the problem

[0014] The present invention aims to solve the above-mentioned problems.

[0015] A container body comprising an upper chamber for receiving collected blood after centrifugation and a lower chamber communicating with the lower part of the upper chamber;

[0016] A lifting unit disposed in the lower chamber and raising and lowering the platelet layer by adjusting the position of the buffy coat layer according to the height of the red blood cell layer stored in the upper chamber; and

[0017] An extraction unit provided at the upper opening of the upper chamber, capable of separating and extracting the platelet layer collected at the top of the upper chamber.

[0018] A platelet concentrate extraction device for blood centrifugation is provided.

[0019] In an embodiment of the present invention, the lifting member may further include: a lower cap surrounding the lower opening of the lower chamber and rotating about the center of the circle of the lower chamber as an axis; a spiral member comprising a female spiral shaft extending from the center of the lower cap to the lower part of the upper chamber and a male spiral cylinder formed longer than the female spiral shaft and spirally coupled to the female spiral shaft; a fixing plate fixedly disposed between the upper chamber and the lower chamber and having its center spirally coupled to the male spiral cylinder; and a compression member having a compression plate seated on one surface of the fixing plate and coupled to the upper end of the male spiral cylinder.

[0020] In an embodiment of the present invention, the compression part may be characterized in that when the lower cap is rotated in one direction, the male spiral cylinder moves up and down along the spiral due to the rotation of the female spiral axis, thereby causing the compression plate to move up and down to collect the platelet layer in the extraction part.

[0021] In an embodiment of the present invention, the compression portion may further include a compression projection that assists in the compression of the platelet layer when the compression plate is raised and lowered, wherein one surface of the compression plate protrudes and the male spiral cylinder is coupled thereto; a packing portion surrounding the compression plate; and a sealing projection portion that is in close contact with the inner surface of the container body portion by having a plurality of projections protruding along the outer surface of the packing portion.

[0022] In an embodiment of the present invention, the extraction unit further comprises a Luer lock connector provided in an upper cap that opens and closes the upper opening; and a plasma compression unit having an extraction tube communicating with the Luer lock connector and a receiving portion at the end of the extraction tube that widens in circumference toward the inner surface of the upper chamber, wherein the plasma compression unit is provided with a stopper inside the upper chamber so that when the platelet layer moves to the upper part of the upper chamber, the receiving portion descends and settles on the stopper, thereby separating the leukocyte layer, which is part of the buffy coat layer, from the platelet layer.

[0023] In an embodiment of the present invention, the plasma compression part may be characterized by being able to vary the flow rate of the platelet layer by the pressure difference of the receiving part by the suction force of a syringe connected to the Luer lock connector.

[0024] An embodiment of the present invention is,

[0025] After first extracting the platelet layer, the lower extraction unit extracts the red blood cell layer from the remaining blood and further centrifuges the blood remaining in the upper chamber to further extract the platelet layer, and the lower extraction unit may further include a lower extraction tube that passes through the male spiral cylinder and communicates with the lower cap; and a lower Luer lock connector provided at the top of the lower extraction tube and connected to the lower cap, which extracts the red blood cell layer with the syringe through the upper part of the lower extraction tube only when suction force of the syringe is applied. Effects of the invention

[0026] The platelet concentrate extraction device for blood centrifugation according to the present invention rotates the lower cap to push the compression plate coupled to the male spiral cylinder up to the receiving portion, thereby extracting highly concentrated platelets to the maximum extent without loss of the buffy coat layer, and thus obtaining a higher recovery rate of platelets compared to existing products.

[0027] In addition, it has the advantage of being equipped with a funnel-shaped receiving portion that can collect the platelet layer in one place, allowing for the extraction of highly concentrated plasma in a single process without the need for separate containers or auxiliary devices.

[0028] In addition, a sealing projection is formed along the outer surface of the packing portion surrounding the compression plate to seal the space between the compression plate and the inner surface of the container body, thereby preventing blood leakage or the inflow of external contaminants.

[0029] In addition, various syringes ranging from 1cc to 30cc can be connected to conveniently extract the desired amount, and there is the advantage of easy use and storage as there are no additional parts.

[0030] In addition, a lower extraction unit connected to the lower cap is provided to extract the platelet layer first, then extract red blood cells from the remaining blood into the lower extraction unit, and then further centrifuge the blood remaining in the upper chamber to extract more concentrated platelets. Brief explanation of the drawing

[0031] FIG. 1 is a perspective view showing the exterior of a platelet concentrate extraction device for blood centrifugation according to an embodiment of the present invention. FIG. 2 is a cross-sectional view illustrating a platelet concentrate extraction device for blood centrifugation according to an embodiment of the present invention. FIG. 3 is an exemplary diagram illustrating the state in which platelets move to the extraction section by operating the lifting section of a platelet concentrate extraction device for blood centrifugation according to an embodiment of the present invention. FIG. 4 is an exemplary diagram illustrating the state of extracting a platelet layer separated from a buffy coat layer using a platelet concentrate extraction device for blood centrifugation according to an embodiment of the present invention. FIG. 5 is an exemplary diagram illustrating the lower extraction section of a platelet concentrate extraction device for blood centrifugation according to an embodiment of the present invention. Specific details for implementing the invention

[0032] Hereinafter, preferred embodiments of the present invention, which can be easily practiced by those skilled in the art to which the present invention pertains, will be described in detail with reference to the attached drawings. However, in describing the operating principles of the preferred embodiments of the present invention in detail, if it is determined that a detailed description of related known functions or configurations may unnecessarily obscure the essence of the present invention, such detailed description will be omitted.

[0033] In addition, the same reference numerals are used for parts that have similar functions and operations throughout the drawing.

[0034] Additionally, when a part of a specification is described as being 'connected' to another part, this includes not only cases where they are directly connected but also cases where they are indirectly connected with other components in between. Furthermore, 'including' a component means that, unless specifically stated otherwise, it does not exclude other components but may include additional components.

[0035] Hereinafter, a platelet concentrate extraction device for blood centrifugation according to a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.

[0036] FIG. 1 is a perspective view showing the exterior of a platelet concentrate extraction device for blood centrifugation according to an embodiment of the present invention, FIG. 2 is a cross-sectional view showing a platelet concentrate extraction device for blood centrifugation according to an embodiment of the present invention, FIG. 3 is an exemplary diagram showing the state in which platelets move to the extraction section by operating the lifting section of the platelet concentrate extraction device for blood centrifugation according to an embodiment of the present invention, FIG. 4 is an exemplary diagram showing the state of extracting a platelet layer separated from the buffy coat layer using a platelet concentrate extraction device for blood centrifugation according to an embodiment of the present invention, and FIG. 5 is an exemplary diagram showing the lower extraction section of a platelet concentrate extraction device for blood centrifugation according to an embodiment of the present invention.

[0038] As illustrated in FIG. 1, a platelet concentrate extraction device (10) for blood centrifugation according to an embodiment of the present invention includes a container body (100), a lifting part (200), and an extraction part (300).

[0039] More specifically, as illustrated in FIGS. 1 and 2, a platelet concentrate extraction device (10) for blood centrifugation according to an embodiment of the present invention comprises a container body (100) including an upper chamber (110) for receiving collected blood after centrifugation and a lower chamber (120) communicating with the lower part of the upper chamber, a lifting part (200) disposed in the lower chamber and raising and lowering the platelet layer by adjusting the position of the buffy coat layer (b) according to the height of the red blood cell layer (a) stored in the upper chamber, and an extraction part (300) provided in the upper opening of the upper chamber to separate and extract the platelet layer that is gathered at the upper part of the upper chamber.

[0040] The term 'Buffy coat layer' as used in the specification herein refers to a layer in which a white blood cell layer (b) and a platelet layer (c) are mixed, and may include indicating the platelet layer (c) unless specifically stated otherwise. And 'plasma (d)' refers to a layer located at the top of the platelet layer (c) and may include indicating that the plasma (d) is also separated and extracted when the platelets and platelet layer are described as being separated and extracted.

[0041] Referring to FIGS. 1 and 2, the container body (100) is a container that extends in the longitudinal direction and forms a space inside, and the upper chamber (110) and lower chamber (120) are integrally formed and divided into upper and lower sections by the position of the fixing plate (230).

[0042] In addition, the main body of the container (100) stores the collected blood in the upper chamber (110) and receives it in a blood centrifuge to complete the centrifugation of the blood, and then allows the platelet layer (c) to be separated and extracted while divided into the lowest layer, the red blood cell layer (a), the white blood cell layer (b), the buffy coat layer, which is the platelet layer (c), and the uppermost layer, the plasma layer (d).

[0043] As illustrated in FIGS. 2 and 3, in the platelet concentrate extraction device (10) for blood centrifugation according to an embodiment of the present invention, the lifting unit (200) is positioned in the lower chamber (120) and serves to raise and lower the platelet layer (c) by adjusting the position of the buffy coat layer according to the height of the red blood cell layer (a) stored in the upper chamber (110).

[0044] To this end, the lifting unit (200) further includes a lower cap (210), a spiral part (220), a fixing plate (230), and a compression part (240).

[0045] The lower cap (210) surrounds the lower opening of the lower chamber (120) and rotates around the center of the circle of the lower chamber (120), thereby acting as a dial that rotates the female spiral shaft (221) of the spiral portion (220) by being coupled thereto.

[0046] Referring to FIGS. 2 and 3, the spiral portion (220) is composed of a female spiral shaft (221) extending from the center of the lower cap (210) to the lower part of the upper chamber (110) and a male spiral cylinder (222) that is spirally coupled to the female spiral shaft (221) and formed to be longer than the female spiral shaft (221).

[0047] The female spiral shaft (221) extends from the center of the lower cap (210) to the lower part of the fixing plate (230) and has a spiral on its inner surface so that it can prevent the male spiral cylinder (222), which is spirally coupled to the inside, from coming off even if it spirally rotates and moves up and down.

[0048] The male spiral cylinder (222) forms a spiral on its outer surface and is received inside the female spiral shaft (221) to be spirally coupled. The upper part of the male spiral cylinder (222) is spirally coupled to the fixing plate (230) so that it can move up and down along the spiral by rotating the female spiral shaft (221).

[0049] The fixing plate (230) is fixedly positioned between the upper chamber (110) and the lower chamber (120) and is spirally coupled to the male spiral cylinder (222) at its center, thereby holding the male spiral cylinder (222) to rotate the male spiral cylinder (222) in accordance with the rotation of the female spiral axis (221).

[0050] For example, if there is no fixed plate (230), even if the female spiral shaft (221) rotates, it cannot hold the male spiral cylinder (222), so it is simply coupled to the female spiral shaft (221), and there is a problem that the male spiral cylinder (222) does not move up or down in response to the rotation of the female spiral shaft (221) and rotates in the same way.

[0051] Referring to FIGS. 2 to 4, the compression portion (240) is provided with a compression plate (241) that is seated on one surface of the fixing plate (230) and coupled to the upper end of the male spiral cylinder (222). The compression plate (241) allows the red blood cell layer (a) of the centrifuged blood to be seated.

[0052] In particular, when the lower cap (210) is rotated in one direction, the male spiral cylinder (222) moves up and down along the spiral by the rotation of the female spiral shaft (221), causing the compression plate (241) to move up and down so that the platelet layer (c) is collected in the extraction part (300).

[0053] These compression portions (240) may further include compression protrusions (242), packing portions (243), and sealing protrusions (244).

[0054] The compression projection (242) is a projection that assists in the compression of the platelet layer (c) when the compression plate (241) is raised and lowered, with a male spiral cylinder (222) coupled inside the compression plate (241) protruding from one side of the compression plate (241).

[0055] To explain further, the center of one side of the compression plate (241) protrudes upward with a reduced diameter, and a male spiral cylinder (222) is coupled inside. At this time, the lower cap (210) is rotated in one direction so that the compression plate (241) rises in response to the rising and falling of the male spiral cylinder (222), thereby positioning the compression projection (242) adjacent to the inside of the receiving portion (322) described later.

[0056] Then, as the pressure plate (241) rises and falls, the plasma (d) located on the upper part of the buffy coat layer, which is the platelet layer (c) and the white blood cell layer (b), is collected in the receiving part (322). Then, the pressure projection (242) pushes and compresses the buffy coat layer and the plasma (d) to increase the pressure. Afterwards, as shown in FIG. 4, the speed of movement of the buffy coat layer and the plasma (c), whose pressure has been increased by the suction force of the syringe (11) connected to the extraction part (300), to the syringe (11) where negative pressure is generated is increased, thereby increasing the flow rate of the remaining buffy coat layer and the plasma (c) located in the receiving part (322).

[0057] The packing portion (243) surrounds the compression plate (241) to prevent a gap between the circumference of the compression plate (241) and the inner circumference of the container body portion (100).

[0058] The sealing protrusion (244) is provided with a plurality of protrusions protruding along the outer surface of the packing part (243) and is in close contact with the inner surface of the container body part (100) to increase the sealing force, thereby preventing the red blood cell layer (a) located on the compression plate (241) from leaking out or external contaminants from entering the interior of the container body part (100).

[0059] As illustrated in FIGS. 3 and 4, in the platelet concentrate extraction device (10) for blood centrifugation according to an embodiment of the present invention, the extraction unit (300) is provided at the upper opening of the upper chamber (110) to enable the separation and extraction of the platelet layer (c) that is collected at the top of the upper chamber (110).

[0060] To this end, the extraction unit (300) may further include a Luer lock connector (310) and a plasma compression unit (320).

[0061] The Luer lock connector (310) is provided in an upper cap (301) that opens and closes an upper opening and forms a passage through which a syringe (11) can be connected to extract the buffy coat layer and plasma (c) collected in the plasma compression part (320). However, the passage is opened only when the suction force of the syringe (11) is applied, thereby preventing external contaminants and air from entering and allowing the plasma compression part (320) to be sealed.

[0062] The plasma compression section (320) is provided with an extraction tube (321) communicating with the Luer lock connector (310) and a receiving section (322) at the end of the extraction tube (321) that widens in circumference toward the inner surface of the upper chamber (110).

[0063] In particular, the plasma compression part (320) is equipped with a stopper (323) on the inner side of the upper chamber (110) so that when the platelet layer (c) moves to the upper part of the upper chamber (110), the receiving part (322) is lowered and settled on the stopper (323), and the platelet layer (c), which is part of the buffy coat layer, can be separated.

[0064] Additionally, the plasma compression part (320) allows the flow rate of the platelet layer (c) to be varied by the pressure difference in the receiving part (322) by the suction force of the syringe (11) connected to the Luer lock connector (310).

[0065] Meanwhile, the receiving portion (322) is formed in the shape of a funnel, so that less than 1% of the useful cell layer is collected and extracted, allowing the effect of the cell layer being collected to be observed visually. In addition, it is formed in a cylindrical structure, so the loss of the platelet layer (c) in terms of volume is small, which can increase the recovery rate.

[0066] For example, the operation process of the plasma compression section (320) is explained as shown in FIG. 2, where the receiving section (322) is separated from the stopper (323), the compression plate (240) is raised and lowered so that the buffy coat layer and plasma (d) pass through the stopper (323) and are adjacent to the receiving section (322).

[0067] At this time, the receiving portion (322) is lowered and settled on the stopper (323), so that the buffy coat layer and plasma (d) flow into the interior of the receiving portion (322), are collected, and compressed. Then, the buffy coat layer and plasma (d) are further compressed by the compression protrusion (242), and the pressure increases.

[0068] Additionally, the platelet layer (c), which is relatively lighter than the white blood cell layer (b), moves upward and is separated from the white blood cell layer (b) in the buffy coat layer. As shown in FIG. 4, by connecting the syringe (11) to the Luer lock connector (310) and applying a suction force to generate negative pressure, the platelet layer (c) and plasma (d) move through the extraction tube (321) to the syringe (11) by the high pressure pushing force of the receiving portion (322).

[0069] As illustrated in FIG. 5, the platelet concentrate extraction device (10) for blood centrifugation according to an embodiment of the present invention may include a lower extraction unit (400).

[0070] The lower extraction unit (400) extracts the red blood cell layer (a) from the remaining blood after the first extraction of the platelet layer (c), and further centrifuges the remaining blood in the upper chamber (110) to extract the platelet layer (c) further.

[0071] To this end, the lower extraction unit (400) further includes a lower extraction tube (410) and a lower Luer lock connector (420).

[0072] The lower extraction tube (410) is a tube that passes through the male spiral cylinder (222) and communicates with the lower cap, and is a passage that moves the red blood cell layer (a) flowing into the lower Luer lock connector (420) to the lower cap (210).

[0073] The lower Luer lock connector (420) is provided at the top of the lower extraction tube (310) and serves to extract the red blood cell layer (a) through the syringe (11) via the upper part of the lower extraction tube (410) only when the suction force of the syringe (11) connected to the lower cap (210) is applied.

[0074] As a result, the blood remaining in the upper chamber (110) is centrifuged once more. Then, the lower cap (210) is rotated in one direction so that the male spiral cylinder (222) moves up and down along the spiral of the female spiral axis (221) as shown in FIGS. 3 and 4, and the compression plate (241) is separated from the fixing plate (230) and moves up toward the receiving portion (322). The buffy coat layer and plasma (d) are adjacent to the receiving portion (322), and the receiving portion (322) is lowered to separate the platelet layer (c) from the leukocyte layer (b), thereby producing a highly concentrated platelet layer (c) and plasma (d).

[0075] Through this method, the recovery rate can be increased, and two centrifugation steps can be processed with a single device, providing convenience and preventing contamination by minimizing external exposure.

[0076] As explained above, the detailed description of the present invention describes preferred embodiments of the invention; however, this is merely an illustrative description of the best embodiments of the invention and is not intended to limit the invention. Furthermore, it is obvious that anyone skilled in the art to which the present invention pertains can make various modifications and imitations within the scope of the technical concept of the present invention without departing from it.

[0077] Accordingly, the scope of the present invention is not limited to the embodiments described above but may be implemented in various forms of embodiments within the scope of the appended claims. Furthermore, it is deemed that the scope of the claims of the present invention includes various modifications that are possible by anyone with ordinary knowledge in the technical field to which the invention belongs, without departing from the essence of the invention claimed in the claims. Explanation of the symbols

[0078] 10: Platelet concentrate extraction device for blood centrifugation 11 : Syringe 100 : Container body 110 : Upper chamber 120 : Lower chamber 200 : Lifting section 210 : Bottom cap 220 : Spiral part 221 : Female spiral axis 222 : Male spiral cylinder 230 : Fixing plate 240 : Compression part 241 : Pressing plate 242 : Compression protrusion 243 : Packing section 244 : Sealing protrusion 300 : Extraction part 301 : Top cap 310 : Lure lock connector 320 : Plasma compression section 321 : Extraction tube 322 : Reception Section 323 : Stopper 400 : Lower extraction unit 410 : Lower extraction tube 420 : Lower Lure Lock Connector

Claims

Claim 1 A container body comprising an upper chamber for receiving collected blood after centrifugation and a lower chamber communicating with the lower part of the upper chamber; a lifting unit disposed in the lower chamber that raises and lowers a platelet layer by adjusting the position of a buffy coat layer according to the height of a red blood cell layer stored in the upper chamber; and an extraction unit provided in an upper opening of the upper chamber to separate and extract the platelet layer that gathers at the upper part of the upper chamber, wherein the extraction unit comprises a Luer lock connector provided in an upper cap that opens and closes the upper opening. A platelet concentrate extraction device for blood centrifugation, further comprising an extraction tube communicating with the Luer lock connector and a plasma compression part having a receiving portion at the end of the extraction tube that widens in circumference toward the inner surface of the upper chamber, wherein the plasma compression part is provided with a stopper on the inner side of the upper chamber so that when the platelet layer moves toward the upper part of the upper chamber, the receiving portion descends and settles on the stopper, thereby separating the leukocyte layer, which is part of the buffy coat layer, from the platelet layer. Claim 2 A platelet concentrate extraction device for blood centrifugation according to claim 1, further comprising: a lower cap surrounding the lower opening of the lower chamber and rotating about the center of the circle of the lower chamber as an axis; a spiral part consisting of a female spiral shaft extending from the center of the lower cap to the lower part of the upper chamber and a male spiral cylinder formed longer than the female spiral shaft and spirally coupled to the female spiral shaft; a fixing plate fixedly disposed between the upper chamber and the lower chamber and having its center spirally coupled to the male spiral cylinder; and a compression part having a compression plate seated on one surface of the fixing plate and coupled to the upper end of the male spiral cylinder. Claim 3 A platelet concentrate extraction device for blood centrifugation according to claim 2, wherein the compression part is characterized by the fact that when the lower cap is rotated in one direction, the male spiral cylinder moves up and down along the spiral due to the rotation of the female spiral axis, thereby causing the compression plate to move up and down to collect the platelet layer in the extraction part. Claim 4 A platelet concentrate extraction device for blood centrifugation according to claim 2, wherein the compression portion comprises: a compression projection that assists in the compression of the platelet layer when the compression plate is raised and lowered, wherein one surface of the compression plate protrudes and the male screw cylinder is coupled thereto; a packing portion surrounding the compression plate; and a sealing projection portion that is in close contact with the inner surface of the container body portion by having a plurality of projections protruding along the outer surface of the packing portion. Claim 5 delete Claim 6 A platelet concentrate extraction device for blood centrifugation according to claim 1, characterized in that the plasma compression part allows the flow rate of the platelet layer to be varied by the pressure difference of the receiving part by the suction force of a syringe connected to the Luer lock connector. Claim 7 A platelet concentrate extraction device for blood centrifugation according to claim 2, comprising a lower extraction unit that extracts a red blood cell layer from the remaining blood after the platelet layer is first extracted, and further centrifuges the blood remaining in the upper chamber to further extract the platelet layer, wherein the lower extraction unit comprises: a lower extraction tube that passes through the male spiral cylinder and communicates with the lower cap; and a lower Luer lock connector provided at the upper end of the lower extraction tube and extracts the red blood cell layer with the syringe through the upper end of the lower extraction tube only when suction force of the syringe connected to the lower cap is applied.

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