Platelet-rich plasma raw material extractor

Abstract

The utility model relates to the technical field of medical instruments, in particular to a platelet-rich plasma raw material extractor which comprises a blood sampling outer barrel, a blood sampling movable barrel inserted into an inner cavity of the blood sampling outer barrel in a sliding mode in the axial direction, an injection inner barrel detachably connected to an inner cavity of the blood sampling movable barrel and an injection push rod inserted into an inner cavity of the injection inner barrel in a sliding mode in the axial direction. The head of the blood sampling outer cylinder is detachably connected with a sealing cover for blocking a needle hole of the blood sampling outer cylinder, the head of the blood sampling movable cylinder is provided with a blood sampling piston which is in sealed sliding connection with the inner circumferential wall of the blood sampling outer cylinder, and the head of the injection push rod is provided with an injection piston which is in sealed sliding connection with the inner circumferential wall of the injection inner cylinder; a through hole is formed in the head of the blood sampling movable cylinder, the needle hole of the blood sampling outer cylinder, the through hole and the needle hole of the injection inner cylinder jointly form a fluid communication channel, and a fixing piece used for limiting relative sliding of the injection push rod and the injection inner cylinder is detachably connected between the injection push rod and the injection inner cylinder. The method has the effect of accurately controlling the extraction amount of the platelet-rich plasma.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of medical devices, in particular to a platelet-rich plasma raw material extractor. BACKGROUND

[0002] Platelet-rich plasma (PRP) is a kind of plasma rich in platelets extracted from autologous blood by centrifugation technology. This plasma contains high concentrations of growth factors and cytokines, which can promote tissue repair and regeneration. Platelet-rich plasma has a wide range of applications in the medical field, especially in the fields of trauma repair, orthopedics, plastic surgery and dermatology. By injecting PRP, wound healing can be accelerated, soft tissue injury can be improved, and even in some cases, chronic pain can be treated.

[0003] In the extraction process of the extractor in the prior art, the extraction amount cannot be accurately controlled, which may result in that the quality and concentration of the extracted platelet-rich plasma cannot reach the best state, and therefore further improvement is needed. CONTENT OF THE INVENTION

[0004] In order to accurately control the extraction amount of platelet-rich plasma, the application provides a platelet-rich plasma raw material extractor.

[0005] The platelet-rich plasma raw material extractor provided by the application adopts the following technical scheme:

[0006] A platelet-rich plasma raw material extractor, comprising a blood collection outer cylinder, a blood collection movable cylinder axially slidingly inserted into the inner cavity of the blood collection outer cylinder, an injection inner cylinder detachably connected to the inner cavity of the blood collection movable cylinder, and an injection push rod axially slidingly inserted into the inner cavity of the injection inner cylinder, the head of the blood collection outer cylinder is detachably connected with a cover for plugging the needle hole of the blood collection outer cylinder, the head of the blood collection movable cylinder is provided with a blood collection piston sealingly and slidingly connected to the inner wall of the blood collection outer cylinder, the head of the injection push rod is provided with an injection piston sealingly and slidingly connected to the inner wall of the injection inner cylinder, the head of the blood collection movable cylinder has a through hole, the needle hole of the blood collection outer cylinder, the through hole and the needle hole of the injection inner cylinder jointly form a fluid communication channel, and the injection push rod and the injection inner cylinder are detachably connected with a fixing member for limiting the relative sliding of the injection push rod and the injection inner cylinder.

[0007] By adopting the technical scheme, in normal state, the fixing member is installed between the injection push rod and the injection inner cylinder, during blood collection, the cover is disassembled, the blood collection needle sleeve is connected to the needle hole of the blood collection outer cylinder, the blood collection needle is connected to the patient, the injection push rod is pulled to drive the injection inner cylinder and the blood collection movable cylinder to retreat together, and blood enters the inner cavity of the blood collection outer cylinder; subsequently, the cover is installed, the extractor is put into the centrifuge as a whole to perform centrifugal operation, after centrifugal stratification is completed, the fixing member is disassembled, and the injection push rod is pulled to retreat relative to the injection inner cylinder, centrifugal liquid enters the injection inner cylinder through the through hole of the blood collection movable cylinder and the needle hole of the injection inner cylinder, and the extraction of platelet-rich plasma is completed; finally, the injection inner cylinder is disassembled, and the platelet-rich plasma is taken out from the inner cavity of the blood collection movable cylinder to perform platelet-rich plasma injection operation, and the fixing member effectively prevents the relative sliding of the injection push rod and the injection inner cylinder when the injection push rod is pulled during blood collection, and the extraction amount of subsequent platelet-rich plasma is accurately controlled.

[0008] Preferably, the end part of the injection inner cylinder is provided with a clamping plate, the fixing member comprises a fixed plate abutting against the upper end surface of the injection push rod and located above the clamping plate, and a claw fixedly connected to the side wall of the fixed plate, the claw is provided with at least two, and the two claws are respectively arranged on the opposite two side walls of the fixed plate, and the other end of the claw has a hook part overlapping the lower end surface of the clamping plate.

[0009] By adopting the technical scheme, in normal state, the hook part of the claw abuts against the lower end surface of the clamping plate, and the lower end surface of the fixed plate abuts against the upper end surface of the injection push rod, so as to limit the relative sliding of the injection push rod and the injection inner cylinder, when the platelet-rich plasma in the blood collection outer cylinder needs to be extracted, an acting force is applied to the lower end of the claw, so that the lower end of the claw is deformed outward, and the hook part of the claw is out of the clamping plate, that is, the fixed plate can be moved upward, so as to release the limitation of the relative sliding of the injection push rod and the injection inner cylinder, and then the injection push rod is pulled to retreat relative to the injection inner cylinder, and centrifugal liquid enters the injection inner cylinder through the through hole of the blood collection movable cylinder and the needle hole of the injection inner cylinder.

[0010] Preferably, the same outer wall of the fixed plate is provided with at least two claws.

[0011] By adopting the technical scheme, the number of claws is increased, and the fixing effect of the injection push rod and the injection inner cylinder is improved.

[0012] Preferably, a connecting rod is fixedly connected between the two claws on the same side wall of the fixed plate.

[0013] By adopting the technical scheme, an acting force is applied to the connecting rod, so that the hook parts of the multiple claws on the same side of the fixed plate are simultaneously out of the clamping plate, and the operation convenience is improved.

[0014] Preferably, the upper end face of the injection push rod is protrudingly and fixedly connected with a pull ring, and the upper outer lateral wall of the blood collection outer cylinder is provided with an outer cylinder holding part, the outer cylinder holding part is provided with two and is symmetrically arranged along the axis of the blood collection outer cylinder, and the lower surface of the outer cylinder holding part is a circular arc surface.

[0015] By adopting the above technical scheme, the pull ring and the outer cylinder holding part are additionally arranged, when blood is collected, the index finger and the middle finger of the operator are respectively arranged on the circular arc surface of the outer cylinder holding part, the thumb of the operator is inserted into the pull ring, the thumb is forced to move away from the extractor, and then the blood is drawn, so that one-hand operation is realized.

[0016] Preferably, the circular arc surface of the outer cylinder holding part is semicircular, the circular arc surface of the outer cylinder holding part is provided with a sliding groove in the circumferential direction, the outer cylinder holding part is provided with an extension strip which is slidably connected to the sliding groove, the extension strip is an arc-shaped strip, and a limiting piece is arranged between the outer cylinder holding part and the extension strip to fix the sliding position of the extension strip.

[0017] By adopting the above technical scheme, when the extension strip is slidably retracted into the sliding groove, the outer cylinder holding part presents a semicircular shape, when the extension strip is slidably extended below the outer cylinder holding part, the circular arc surface of the outer cylinder holding part and the extension strip form a nearly circular shape, when blood is drawn, the nearly circular shape is used, so that force can be conveniently applied and operation is convenient; after blood drawing is completed, the outer cylinder holding part returns to the semicircular shape, and the outer cylinder holding part can better fix the extractor in cooperation with the insertion slot on the centrifugal machine (the insertion slot can be fixedly arranged on the centrifugal machine in cooperation), so that the separation effect is ensured.

[0018] Preferably, the limiting piece is a top screw which is threadedly arranged at the end portion of the extension strip, and the screw nut of the top screw abuts against the circular arc surface of the outer cylinder holding part.

[0019] By adopting the above technical scheme, after the extension strip is slid, the top screw is tightened, the screw nut of the top screw abuts against the circular arc surface of the outer cylinder holding part, and the extension strip is fixed in a damping form.

[0020] Preferably, the upper portion of the injection inner cylinder is provided with an inner cylinder holding part, the inner cylinder holding part is provided with two and is symmetrically distributed along the axis of the injection inner cylinder, and the outer lateral surface of the inner cylinder holding part is a circular arc surface.

[0021] By adopting the above technical scheme, after centrifugal separation is completed, the fixing piece is disassembled, the index finger and the middle finger of the operator abut against the circular arc surfaces of the two inner cylinder holding parts, the thumb of the operator is inserted into the pull ring, and the thumb is forced to move away from the blood collection outer cylinder, so that the blood plasma and the platelets are drawn.

[0022] In summary, the utility model has the following beneficial effects:

[0023] 1、Normal state, fixed between the injection push rod and the injection inner cylinder, blood collection, disassembly cover, blood needle set in the blood needle sleeve, blood needle in patients, through the injection push rod, drive injection inner cylinder and blood activity cylinder retreat together, blood into the blood collection outer barrel inner cavity; Then install the cover, the whole extractor into the centrifuge for centrifugation operation, when the centrifugal layer is completed, disassemble the fixed, and pull the injection push rod, so that the injection push rod retreats relative to the injection inner cylinder, the centrifugal liquid will pass through the through hole of the blood activity cylinder and the needle hole of the injection inner cylinder into the injection inner cylinder, complete the extraction of platelet-rich plasma; Finally, disassemble the injection inner cylinder, take out from the blood activity cylinder inner cavity for platelet-rich plasma injection operation, the fixed is added to effectively prevent the relative sliding of the injection push rod and the injection inner cylinder when pulling the injection push rod during blood collection, and the extraction amount of subsequent platelet-rich plasma is accurately controlled;

[0024] 2、Add extension bar and limiting piece, when the extension bar slides and shrinks in the sliding groove, the outer cylinder holding part presents a semicircular shape, when the extension bar slides and extends below the outer cylinder holding part, the circular surface of the outer cylinder holding part and the extension bar form a near-circular shape, when extracting blood, the circular shape is used, which is convenient to force and easy to operate; After completing blood extraction, the outer cylinder holding part restores to a semicircular shape, and the outer cylinder holding part cooperates with the insertion slot on the centrifuge (the insertion slot can be fixedly arranged on the centrifuge) to better fix the extractor, and the separation effect is guaranteed. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is the overall structure schematic diagram of a platelet-rich plasma raw material extractor in embodiment 1;

[0026] Figure 2 is the cross-sectional structure schematic diagram of a platelet-rich plasma raw material extractor in embodiment 1;

[0027] Figure 3 is Figure 1 is a local enlarged schematic view at A;

[0028] Figure 4 is the structure schematic diagram of the blood activity cylinder in embodiment 1;

[0029] Figure 5 is the structure schematic diagram of the fixed in embodiment 1;

[0030] Figure 6 is the structure schematic diagram of the fixed in embodiment 2.

[0031] In the figure, 1, blood collection outer barrel; 11, blood collection needle head; 12, blood collection screw sleeve; 13, outer barrel holding part; 14, sliding groove; 15, extension strip; 16, jackscrew; 2, blood collection movable barrel; 21, intermediate tube; 22, through hole; 23, blood collection piston; 24, observation hole; 3, injection inner barrel; 31, injection needle head; 32, injection screw sleeve; 33, clamping plate; 34, inner barrel holding part; 4, injection push rod; 41, injection piston; 42, push plate; 43, pull ring; 5, cover; 51, cover plate; 52, inner sleeve; 53, outer sleeve; 6, fixing piece; 61, fixing plate; 62, clamping jaw; 63, through slot; 64, hook portion; 65, connecting rod. DETAILED DESCRIPTION

[0032] The following will be described in detail with reference to the accompanying drawings. Figures 1-6 The application is further described in detail.

[0033] Example 1

[0034] The application discloses a platelet-rich plasma raw material extractor, which refers to Figure 1 , Figure 2 , comprising a blood collection outer barrel 1, a blood collection movable barrel 2 axially slidingly inserted into the inner cavity of the blood collection outer barrel 1, an injection inner barrel 3 detachably connected to the inner cavity of the blood collection movable barrel 2, and an injection push rod 4 axially slidingly inserted into the inner cavity of the injection inner barrel 3, wherein the blood collection outer barrel 1 and the injection inner barrel 3 are made of transparent material.

[0035] The upper end of the blood collection outer barrel 1 is an open end, the lower end of the blood collection outer barrel 1 is a closed end, the lower end of the blood collection outer barrel 1 is coaxially fixedly connected with a blood collection needle head 11, and the blood collection needle head 11 is integrally formed with the blood collection outer barrel 1. A needle hole communicating with the inner cavity of the blood collection outer barrel 1 is formed in the lower end of the blood collection needle head 11 in the axial direction, the lower end of the blood collection outer barrel 1 is coaxially fixedly connected with a blood collection screw sleeve 12, the blood collection screw sleeve 12 is integrally formed with the blood collection outer barrel 1, and the inner diameter of the blood collection screw sleeve 12 is greater than the outer diameter of the blood collection needle head 11.

[0036] The lower end of the blood collection outer barrel 1 is detachably connected with a cover 5 for plugging the needle hole of the blood collection outer barrel 1, the cover 5 comprises a cover plate 51, an inner sleeve 52 coaxially fixedly connected to the upper end surface of the cover plate 51, and an outer sleeve 53 coaxially fixedly connected to the upper end surface of the cover plate 51, the inner sleeve 52 is inserted between the blood collection needle head 11 and the blood collection screw sleeve 12, the inner sleeve 52 is threadedly connected to the blood collection screw sleeve 12, and the outer sleeve 53 is sleeved on the blood collection screw sleeve 12.

[0037] Referring to Figure 1 , Figure 3The upper outer wall of the blood collection outer cylinder 1 is provided with an outer cylinder grip portion 13. There are two outer cylinder grip portions 13, which are symmetrically arranged along the axis of the blood collection outer cylinder 1. The lower surface of the outer cylinder grip portion 13 is an arc surface, and the arc surface of the outer cylinder grip portion 13 is semi-circular. The arc surface of the outer cylinder grip portion 13 is provided with a circumferential groove 14. The outer cylinder grip portion 13 is provided with an extension strip 15 adapted to slide and connect to the groove 14. The extension strip 15 is a semi-circular arc strip. A limiting member is provided between the outer cylinder grip portion 13 and the extension strip 15 to fix the sliding position of the extension strip 15. The limiting member is a set screw 16 threaded through the end of the extension strip 15, and the nut of the set screw 16 is tightened against the arc surface of the outer cylinder grip portion 13. When the extension bar 15 slides inward into the groove 14, the outer cylinder grip 13 presents a semi-circular shape. When the extension bar 15 slides out below the outer cylinder grip 13, the arc surface of the outer cylinder grip 13 and the extension bar 15 form a near-circular shape.

[0038] Reference Figure 2 , Figure 4 The upper end of the blood collection cylinder 2 is open, and the lower end is closed. A central tube 21 is coaxially fixedly inserted through the lower end of the blood collection cylinder 2. The inner hole of the central tube 21 is a through hole 22 connecting to the inner cavity of the outer blood collection cylinder 1. A blood collection piston 23, which is slidably and sealingly connected to the inner circumferential wall of the outer blood collection cylinder 1, is fixedly connected to the lower end of the blood collection cylinder 2. The blood collection piston 23 is an elastic seal. Multiple observation holes 24 are provided on the outer circumferential wall of the blood collection cylinder 2 and are distributed around its axis.

[0039] Reference Figure 2 The upper end of the injection inner cylinder 3 is open, and the lower end is closed. An injection needle 31 is coaxially fixedly connected to the lower end face of the injection inner cylinder 3. The lower end of the injection needle 31 has an axially formed needle hole communicating with the inner cavity of the injection inner cylinder 3. The injection needle 31 and the injection inner cylinder 3 are integrally formed, and the injection needle 31 is inserted into the upper part of the intermediate tube 21. An injection sleeve 32 is coaxially fixedly connected to the lower end of the injection inner cylinder 3. The injection sleeve 32 and the injection inner cylinder 3 are integrally formed, and the inner diameter of the injection sleeve 32 is larger than the outer diameter of the injection needle 31. The injection sleeve 32 is threaded onto the upper part of the intermediate tube 21. The injection sleeve 32 has the same structure as the blood collection sleeve 12, allowing the inner sleeve 52 of the cap 5 to also be threadedly inserted into the injection sleeve 32, thus sealing the needle hole of the injection inner cylinder 3 with the cap 5.

[0040] The upper end of the injection inner cylinder 3 is fixedly fitted with a snap-fit ​​plate 33 located above the blood collection movable cylinder 2. The lower end face of the snap-fit ​​plate 33 is fixedly connected to the inner cylinder grip part 34. The outer side of the inner cylinder grip part 34 is an arc surface. There are two inner cylinder grip parts 34, which are symmetrically distributed along the axis of the injection inner cylinder 3. The two inner cylinder grip parts 34 are located on both sides of the blood collection movable cylinder 2.

[0041] ReferenceFigure 1 、 Figure 5 The lower end of the injection push rod 4 is fixedly connected with an injection piston 41 which is in sealing sliding connection with the inner wall of the injection inner cylinder 3, and the injection piston 41 is an elastic sealing member. The upper end surface of the injection push rod 4 is fixedly connected with a push plate 42, and the upper end surface of the push plate 42 is fixedly connected with a pull ring 43. The injection push rod 4 and the injection inner cylinder 3 are detachably connected with a fixing member 6 for limiting the relative sliding of the injection push rod 4 and the injection inner cylinder 3. The fixing member 6 comprises a fixing plate 61 abutting against the upper end surface of the push plate 42 and located above the clamping plate 33, and a clamping jaw 62 fixedly connected with one end of the side wall of the fixing plate 61. The upper end surface of the fixing plate 61 is provided with a through slot 63 for the pull ring 43 to pass through. The clamping jaw 62 is provided with at least four clamping jaws, and in this embodiment, the four clamping jaws 62 are respectively arranged on the opposite two side walls of the fixing plate 61. The other end of the clamping jaw 62 is provided with a hook portion 64 lapping the lower end surface of the clamping plate 33.

[0042] The implementation principle of the platelet-rich plasma raw material extractor according to the embodiment of the application is as follows: under normal circumstances, the hook portion 64 of the clamping jaw 62 abuts against the lower end surface of the clamping plate 33, and the lower end surface of the fixing plate 61 abuts against the upper end surface of the injection push rod 4, thereby limiting the relative sliding of the injection push rod 4 and the injection inner cylinder 3. The extension strip 15 is slidably extended below the outer cylinder holding portion 13. When blood sampling, the cover 5 is unscrewed, the blood sampling needle is sleeved with the blood sampling needle head 11 of the blood sampling outer cylinder 1, and the blood sampling needle is connected with a patient. The index finger and the middle finger of an operator are respectively arranged on the arc surface of the outer cylinder holding portion 13. The thumb of the operator is inserted into the pull ring 43. The thumb is forced to move away from the extractor, thereby driving the injection inner cylinder 3 and the blood sampling movable cylinder 2 to retreat together, and blood enters the inner cavity of the blood sampling outer cylinder 1.

[0043] Subsequently, the cover 5 is screwed, the top wire 16 is unlocked, the extension strip 15 is slid to be retracted in the sliding groove 14, the outer cylinder holding portion 13 returns to the semicircular shape, the outer cylinder holding portion 13 is matched with the insertion slot on the centrifuge, and the centrifuge is subjected to centrifugal operation.

[0044] When the centrifugal separation is completed, the lower end of the clamping jaw 62 is subjected to an acting force, so that the lower end of the clamping jaw 62 is deformed outwardly, thereby making the hook portion 64 of the clamping jaw 62 out of the clamping plate 33. The fixing plate 61 can be moved upwardly, thereby removing the limitation of the relative sliding of the injection push rod 4 and the injection inner cylinder 3. Subsequently, the index finger and the middle finger of the operator abut against the arc surfaces of the two inner cylinder holding portions 34 respectively. The thumb of the operator is inserted into the pull ring 43. The thumb is forced to move away from the blood sampling outer cylinder 1, thereby making the injection push rod 4 retreat relative to the injection inner cylinder 3. The centrifugal liquid enters the injection inner cylinder 3 through the through hole 22 of the blood sampling movable cylinder 2 and the needle hole of the injection inner cylinder 3. The injection inner cylinder 3 is screwed down. The cover 5 is locked to the injection sleeve 32, and the extraction of the platelet-rich plasma is completed.

[0045] Embodiment 2:

[0046] The difference from the embodiment 1 is that, referring to Figure 6 The connecting rod 65 is fixedly connected between the two clamping claws 62 on the same side wall of the fixed plate 61, and an acting force is applied to the connecting rod 65, so that the hook portions 64 of the multiple clamping claws 62 on the same side of the fixed plate 61 are simultaneously released from the clamping plate 33, improving the operation convenience.

[0047] The above are preferred embodiments of the present application, and are not intended to limit the protection scope of the present application, so: all equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A platelet rich plasma raw material extractor characterized by: The application relates to a blood sampling device, which comprises a blood sampling outer cylinder (1), a blood sampling movable cylinder (2) axially slidingly inserted into the inner cavity of the blood sampling outer cylinder (1), an injection inner cylinder (3) detachably connected to the inner cavity of the blood sampling movable cylinder (2), and an injection push rod (4) axially slidingly inserted into the inner cavity of the injection inner cylinder (3), the head of the blood sampling outer cylinder (1) is detachably connected with a cover (5) for plugging the needle hole of the blood sampling outer cylinder (1), the head of the blood sampling movable cylinder (2) is provided with a blood sampling piston (23) sealingly and slidingly connected to the inner peripheral wall of the blood sampling outer cylinder (1), the head of the injection push rod (4) is provided with an injection piston (41) sealingly and slidingly connected to the inner peripheral wall of the injection inner cylinder (3), the head of the blood sampling movable cylinder (2) is provided with a through hole (22), the needle hole of the blood sampling outer cylinder (1), the through hole (22) and the needle hole of the injection inner cylinder (3) jointly form a fluid communication channel, and the injection push rod (4) and the injection inner cylinder (3) are detachably connected with a fixing member (6) for limiting the relative sliding of the injection push rod (4) and the injection inner cylinder (3).

2. The platelet rich plasma raw material extractor of claim 1, wherein: The end of the injection inner cylinder (3) is fixedly sleeved with a clamping plate (33), the fixing member (6) comprises a fixing plate (61) abutting against the upper end surface of the injection push rod (4) and located above the clamping plate (33) and a clamping jaw (62) fixedly connected to the side wall of the fixing plate (61), the clamping jaw (62) is provided with at least two, and the two clamping jaws (62) are respectively arranged on the opposite two side walls of the fixing plate (61), and the other end of the clamping jaw (62) has a hook portion (64) overlapped with the lower end surface of the clamping plate (33).

3. The platelet rich plasma raw material extractor of claim 2, wherein: The same outer wall of the fixing plate (61) is provided with at least two clamping jaws (62).

4. The platelet rich plasma raw material extractor of claim 3, wherein: The two clamping jaws (62) on the same side wall of the fixing plate (61) are fixedly connected with a connecting rod (65).

5. The platelet rich plasma raw material extractor of claim 1, wherein: The upper end surface of the injection push rod (4) is protrusively fixedly connected with a pull ring (43), the upper outer side wall of the blood sampling outer cylinder (1) is provided with an outer cylinder holding portion (13), the outer cylinder holding portion (13) is provided with two and symmetrically arranged along the axis of the blood sampling outer cylinder (1), and the lower surface of the outer cylinder holding portion (13) is a circular arc surface.

6. The platelet rich plasma raw material extractor of claim 5, wherein: The circular arc surface of the outer cylinder holding portion (13) is semicircular, the circular arc surface of the outer cylinder holding portion (13) is provided with a sliding groove (14) along the circumference, the outer cylinder holding portion (13) is provided with an extension strip (15) adaptively and slidingly connected to the sliding groove (14), the extension strip (15) is an arc-shaped strip, and a limiting member for fixing the sliding position of the extension strip (15) is arranged between the outer cylinder holding portion (13) and the extension strip (15).

7. The platelet rich plasma raw material extractor of claim 6, wherein: The limiting member is a jackscrew (16) threadedly penetrating the end portion of the extension strip (15), and the nut of the jackscrew (16) abuts against the circular arc surface of the outer cylinder holding portion (13).

8. The platelet rich plasma raw material extractor of claim 5, wherein: The upper portion of the injection inner cylinder (3) is provided with an inner cylinder holding portion (34), the inner cylinder holding portion (34) is provided with two and symmetrically distributed along the axis of the injection inner cylinder (3), and the outer side surface of the inner cylinder holding portion (34) is a circular arc surface.

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