(19)
(11)EP 3 733 295 A1

(12)EUROPEAN PATENT APPLICATION
published in accordance with Art. 153(4) EPC

(43)Date of publication:
04.11.2020 Bulletin 2020/45

(21)Application number: 19747469.5

(22)Date of filing:  23.01.2019
(51)International Patent Classification (IPC): 
B04B 1/10(2006.01)
B04B 11/00(2006.01)
(86)International application number:
PCT/KR2019/000957
(87)International publication number:
WO 2019/151705 (08.08.2019 Gazette  2019/32)
(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME
Designated Validation States:
KH MA MD TN

(30)Priority: 30.01.2018 KR 20180011502

(71)Applicant: Lee, Jun Seok
Busan 48504 (KR)

(72)Inventor:
  • Lee, Jun Seok
    Busan 48504 (KR)

(74)Representative: Spittle, Mark Charles 
28 Apex House Thomas Street, Trethomas
Caerphilly, CF83 8DP
Caerphilly, CF83 8DP (GB)

  


(54)PISTON FOR CENTRIFUGATION


(57) The centrifugal piston according to the embodiment has the main body; valves which can be moved forward and backward of the above main body from inside as external forces act; and has a flow in which the fluid flows from the front of the main body above to the rear of the main body above, and includes valve support to guide the movement of the valves above.




Description

CROSS REFERENCE TO THE RELATED APPLICATIONS


TECHINICAL FIELD



[0001] The embodiments, below, are for centrifugal pistons.

DESCRIPTION OF THE RELATED ART



[0002] Biological tissue obtained by means of absorption or incision, etc. contains a large amount of oil, blood, and body fluids, etc. Therefore, in general, biological tissue is used by centrifugation. However, the size of the biological tissue might be so small that it is impossible to centrifugation the biological tissue in the traditional way, and/or even if centrifugation is possible, there is a risk of contamination due to exposure to air during centrifugation, and/or it may be difficult to remove body fluids or oils, etc. from the biological tissues. Thus, a structure is being developed to obtain pure fat tissue from which impurities have been removed from the fat tissue by centrifuging the biological tissue (e.g. fat tissue). For example, Korea Publication of Unexamined Patent Applications No. 10-2014-0040050 initiates a dual-type fat absorption device.

DETAILED DESCRIPTION OF THE INVENTION


TECHNICAL SUMMARY



[0003] The purpose of the embodiment is to provide centrifugal pistons that easily separate certain proportions and sizes of biological tissue or body fluids from compounds such as biological tissue and body fluids by opening or blocking the flow depending on the application of external forces.

[0004] The purpose of the embodiment is to provide centrifugal pistons that block the flow from the front to the rear of the piston, even if external force is applied to the piston.
The purpose of the embodiment is to provide centrifugal pistons that open the flow from the front to the rear of the piston, even if external force is applied to the piston during centrifugation.

SUMMARY



[0005] The centrifugal piston according to the embodiment has the main body; valves which can be moved forward and backward of the above main body from inside as external forces act; and has a flow in which the fluid flows from the front of the main body above to the rear of the main body above, and includes valve support to guide the movement of the valves above. Also, when external force is applied to the valves above, the valves may be move forward of the main body above and open the flow above, and if no external force is applied to the above valves, the valve may be move backwards of the main body above and block the flow above.

[0006] The above centrifugal piston located between the inner end of the main body above and the valves above, contains more elastic members that support the valves above, and if external force is applied to the valves above, the above elastic members will be compressed, and if no external force is applied to the valves above, the above elastic members may be extension.

[0007] The weight of the above valve may be set according to the magnitude of the above external force, the elasticity of the above elastic members acting on the above valve and the friction between the above valve and the above valve support.

[0008] The above valve support includes a guide that is aligned with the main body above with the same axis, an inlet formed at the end of one section of the guide above, and the outlet formed at the side of the guide above. The above flow may follow the above guide and lead from the above inlet to the above outlet.

[0009] The above centrifugal piston contains more first inner sealing members and secondary inner sealing members located between the above valve and the above valve support. While the above flow are blocked, the above first inner sealing member may be located in one part of the above guide based on the above outlet, and the above secondary inner sealing member may be located in other parts of the above guide in relation to the above outlet.
The centrifugal piston according to the embodiment may include main body with a central axis; a valve having the same axis as the above central axis and moving forward and backward of the above main body along the center axis above; a valve support equipped with a flow from the front of the main body above to the rear of the main body above which fluid flows, and the above flow is opened or closed by the movement of the valve above; and restriction mechanism of valve movement to selectively block the flow above by selectively restricting the movement of the valves forward to the main body above or backward to the main body above.

[0010] The above restriction mechanism of valve movement may contain a tongue formed on the inner face of the main body and extending in length along the above center axis; and grooves formed on the outer face of the valve along the axis direction of the above center axis and constructed to receipt the above tongue. The above restriction mechanism of valve movement contain more concave formed on the rear surface of the valve above; and protrusion formed on the above valve support, and the above concave and the above protrusion may be snapped each other.
The centrifugal piston according to the embodiment may include the main body with a central axis; a valve having the same axis as the above central axis and moving forward and backward of the above main body from inside; and a locking mechanism to selectively open or block the above flow by fixing the above valve selectively to the above main body.
The above locking mechanism includes more an interlocking element formed on the inner face of the main body above so that it protrudes towards the center of the main body above; the first groove formed on the outer face of the valve above in the axial direction of the above valve; and the second groove formed on the outer face of the valve above in the circumference direction of the above valve and intersected with the first groove. The interlocking elements above may be moved along the first groove above and located in the second groove above and can be interlocked in the second groove above.

ADVANTAGEOUS EFFECTS



[0011] The centrifugal piston according to the embodiment can easily separate certain proportions and sizes of biological tissue and body fluids from compounds such as biological tissue and body fluids by opening or blocking the flow depending on the application of external forces.

[0012] The centrifugal piston according to the embodiment can block the flow from the front of the piston to the rear even if external force is applied to the piston.

[0013] The centrifugal piston according to the embodiment can open the flow from the front of the piston to the rear even if external force is applied to the piston during centrifugation.

[0014] The effect of centrifugal piston according to the embodiment is not limited to those mentioned above and other effects not mentioned above may be clearly understood by ordinary technicians from the following.

BRIEF DESCRIPTION OF THE DRAWINGS



[0015] 

FIG.1 is a perspective view that outlines centrifugal pistons roughly according to the first embodiment.

FIG.2 is a disassembly perspective view that outlines the components of centrifugal pistons roughly according to the first embodiment.

FIG.3 is a disassembly side view that outlines the components of centrifugal pistons roughly according to the first embodiment.

FIG.4 is a drawing that outlines cross section and securing member of centrifugal pistons roughly according to the first embodiment.

FIG.5 is a cross sectional drawing that outlines piston operation when no external force is applied to the centrifugal pistons according to the first embodiment.

FIG.6 is a cross sectional drawing that outlines piston operation when external force is applied to the centrifugal pistons according to the first embodiment.

FIG.7 is an example of centrifugation of fat tissue among biological tissue, and is a cross sectional drawing that outlines the condition after centrifugal pistons is inserted inside the container according to the first embodiment and centrifugation is completed.

FIG.8 is a disassembly perspective view that outlines the centrifugal pistons roughly according to the second embodiment.

FIG.9 is a perspective view that outlines the inside of the main body of the centrifugal pistons roughly according to the second embodiment.

FIG.10 is a first phase diagram that outlines the valve of centrifugal pistons is not supported on the tongue according to the second embodiment.

FIG.11 is a cross sectional drawing of a piston with external force acting without the valve of centrifugal pistons supported by the tongue according to the second embodiment.

FIG.12 is a second phase diagram that outlines the valve of centrifugal pistons is supported on the tongue according to the second embodiment.

FIG.13 is a cross sectional diagram of a piston that outlines the valve of centrifugal pistons is supported on the tongue according to the second embodiment.

FIG.14 is a disassembly perspective view that outlines the centrifugal pistons roughly according to the third embodiment.

FIG.15 is a cross sectional diagram of a piston that outlines the valve of centrifugal pistons is not fixed to the main body according to the third embodiment.

FIG.16 is a cross sectional diagram of a piston that outlines the valve of centrifugal pistons is fixed to the main body according to the third embodiment.


DETAILED DESCRIPTION OF THE EMBODIMENTS


(The Best Form for the Implementation of an Invention)



[0016] Below, the embodiments are described in detail in an example drawing. In adding reference mark to components in each drawing, it should be noted that the same components should have the same mark as possible, even if they are shown on different drawings. Also, in explaining the embodiment, if it is deemed that a specific description of the relevant disclosure of the comprising elements or function interferes with the understanding of the embodiment, the detailed explanation shall be omitted.

[0017] In addition, in describing the components of the embodiment, the terms 1, 2, A, B, (a), (b), etc. may be used.

[0018] These terms are intended to distinguish the components from other components, but the terms do not limit the nature, order, or sequence of the components. If it is stated that one component is "connected", "combined" or "linked" to another component, the component may be directly connected or linked to other component, however, it will have to be understood that another component between each component may be connected", "combined" or "linked".

[0019] The component contained in either embodiment, and those containing common functions, are described in the other embodiment using the same name. Unless there is a no statement against it, the description in either embodiment may apply to other embodiment, and to the extent that they overlap, the specific descriptions shall be omitted.

[0020] The term "front" used in this source refers to the forward direction of the main body based on the main body of the centrifuge piston, and the term "rear" used in this source refers to the backward direction of the main body based on the main body of the centrifuge piston.

[0021] The term "positive pressure" used in this source is when the pressure in front of the piston and the pressure in the rear are greater than the pressure outside the container holding the piston, and the term "negative pressure" used in this source is when the pressure in front of the piston and the pressure in the rear are smaller than the pressure outside the container holding the piston.

[0022] The term "biological tissue" used in this source refers to fat tissue, skin tissue, etc. extracted from the human body.

[0023] The term "body fluid" used in this source refers to blood, free-oil, etc. extracted from the biological tissue.

[0024] The term "external force" used in this source refers to the force generated by an external driving source applied to the piston. For example, the external force applied to the piston may be mainly centrifugal force.

[0025] See FIG.1 or FIG.4 to explain the structure of centrifugal piston (10) according to the first embodiment.

[0026] If you refer to FIG.1 or FIG.4, the centrifugal piston (10) according to the first embodiment may separate the biological tissue and body fluid, etc. with a specific gravity and size from the compound containing the biological tissue and body fluid, etc. Piston (10) may contain main body (11), outer seal (12), filter (13), valve (14), valve support (15), elastic member (16), inner seal (17) and coupling (18).

[0027] The main body (11) may travel in the direction of the length of the container inside a container (1100) (See FIG.7) containing compound biological tissue and body fluid. For example, the container may be a syringe. When external forces (e.g. centrifugal force) are applied to the main body (11) placed in the container, the smaller gravity and smaller size of body fluids of the compounds composed of biological tissue and body fluid located at the front of the main body (11) move towards the rear of the main body (11) to separate the biological tissue and body fluid. For example, the main body (11) may have a cylinder shape with a central axis (X).

[0028] The outer seal (12) is sealed between the outer face of the main body (11) and the inner face (1100) (See FIG.7) of the container (1100) (See FIG.7) to prevent the flow of a compound of biological tissue and body fluids between it. The outer seal (12) may contain the first outer seal member (121) and the second outer seal member (122). In this case, the first outer recess (111) and the second outer recess (112) may be formed on the outer face of the main body (11) in which the first outer seal member (121) and the second outer seal member (122) are joined, respectively.

[0029] For example, the first outer seal member (121) and the second outer seal member (122) may be a ring shape and part of each outer surface of the first outer seal member (121) and the second outer seal member (122) may be recessed. In this case, as the area of contact between the inner face (1110) (See FIG.7) of the container (1100) (See FIG.7) respectively and the first outer seal member (121) and the second outer seal member (122) may decrease, the friction between the inner face (1110) of the container (1100) and the first outer seal member (121) and the second outer seal member (122) may decrease.

[0030] The filter (13) may filter the compound moving from the front of the main body (11) towards the rear of the main body (11). The filter (13) may contain cover (131), protrusion (132) and mesh (133). The cover (131) may be fitted with a central axis (X) that is coaxial to the main body (11) and be joined to the end piece (113) of the main body (11). For example, cover (131) may be fitted with circular plate shape. The protrusion (132) may protrude from the center of the cover (131) along the axis of the center axis (X) of the cover (131). If the main body (11) is moved forward of the main body (11) in which a compound of biological tissue and body fluid exists due to external force, the increased pressure on the compound of biological tissue and body fluid may reduce the number of bubbles contained in the compound of biological tissue and body fluid present in the front of the main body (11). The protrusion (132) may be fitted with a streamlined structure. For example, a protrusion (132) may have a convex side to the cover (131). Under this structure, it may reduce the flow resistance caused by fluid moving along the convex side of the protrusion (132). The mesh (133) may filter body fluids and biological tissues that move from the front of the main body (11) towards the rear of the main body (11). The mesh (133) may consist of pores that are smaller than the size of the biological tissue you wish to separate, and the voids larger than the size of body fluid. Accordingly, out of biological tissue and fluid which move from the front of the main body (11) towards the rear of the main body (11), biological tissue and fluid larger than the size of void and more significant remain at the front of the main body (11), and the biological tissue and body fluids that are smaller than the size of void and less significant than those remaining in the front of main body (11) may move rear of the main body (11). The mesh (133) may be equipped with multiple on the cover (131). For example, the number of meshes (133) can be four. Multiple meshes (133) may be separated from each other around the protrusion (132) and may be installed on the cover (131). For example, multiple meshes (133) may be separated from one another by equal intervals.

[0031] The valve (14) may be moved from the inside of the main body (11) to the front of the main body (11) or to the rear of the main body (11) as external force applies to the valve (14). The valve (14) may be equipped with a central axis (X), which is coaxial to the main body (11). Where, the external force may be the centrifugal force acting on the valve (14) forward of the main body along the axis direction of the center axis (X). The detailed structure of the valve (14) shall be described in detail after describing the valve support (15) and the elastic member (16).

[0032] The valve support (15) supports the valve (14) and may guide the movement of the valve (14) or restrict the movement of the valve (14). The valve support (15) may include guide (151), inlet (152), flow (153), outlet (154) and flange (155). The guide (151) may guide the movement of the valve (14) from inside the main body (11). The guide (151) may have shaft form extending in the axial direction of the center axis (X). The guide (151) may be equipped with a central axis (X), which is coaxial to the main body (11). Accordingly, guide (151) may guide the movement of the valve (14) forward of the main body (11) or may guide the movement of the valve (14) backward of the main body (11). Meanwhile, the main body (11) may contain a receptor (114) that receipts part of the guide (151) of the valve support (15). At the center of receptor (114), a hole may be formed in which part of the guide (151) is receipted. The inlet (152) is formed at the end of the guide (151) so that fluids can flow into the inside of the guide (151) through the inlet (152). The flow (153) is a fluid passage through which the fluid flows from the front of the main body (11) to the rear of the main body (11) and can be formed inside the guide (151) along the length direction of the guide (151). The outlet (154) is formed on the side of the guide (151) so that the fluid can be flow outside the guide (151) through the outlet (154). The flow (153) may lead from the inlet (152) to the outlet (154). The flange (155) may restrict the movement of the valve (14) to the outside of the main body (11). The flange (155) may be formed at the other end of the guide (151). For example, the flange (155) may be equipped with a flange form. When the valve (14) moves towards the rear of the main body (11) and meets the flange (155), movement of the valve (14) may be restricted to the position of the flange (155), which meets the valve (14). Eventually, the valve (14) may be prevented from detaching to outside of the main body (11).

[0033] Meanwhile, the receptor (114) of the main body (11) covers part of the guide (151) and can be extended to the inner center of the main body (11) along the axis direction of the center axis (X). Accordingly, since the valve (14) moves forward of the main body (11) and meets the receptor (114), movement of the valve (14) may be restricted to the position of the receptor (114) where the valve (14) meets. In the end, the valve (14) can be moved along the length direction of the guide (151) between the receptor (114) of the main body (11) and the flange (155) of the valve support (15).

[0034] The elastic member (16) is located between the inner end (115) of the main body (11) and the valve (14) and may be compressed or extension along the length direction of the guide (151). For example, the elastic member (16) may be a spring. Since the first end (161) of the elastic member (16) is located at the inner end (115) of the main body (11) and the second end (162) of the elastic member (16) is located at the depression (142) of the valve (14), the elastic member (16) can elastically support the valve (14) on the main body (11). Meanwhile, the elastic member (16) may be placed on the outer side of the receptor (114) of the main boy (11).

[0035] The inner seal (17) can prevent fluid flow between the inner face of the valve (14) and the outer face of the valve support (15). The inner seal (17) may contain the first inner seal member (171) and the second inner seal member (172) placed between the valve (14) and valve support (15). The first inner seal member (171) and the second inner seal member (172) may be in contact with the guide (151). In some embodiments, where even external force are applied, the valve (14) is restricted from moving and the valve (14) blocks the outlet (154) of the valve support (15), the first inner sealing member (171) may be located on the first part (156) of the side of the guide (151) based on the outlet (154), and the second inner sealing member (172) may be located on the second part (157) of the side of the guide (151) based on the outlet (154). Here, the first part (156) and the second part (157) are opposite each other based on the outlet (154). According to this structure, even if positive or negative pressure is applied within the container (1100) based on the piston (10), the pressure is blocked with the friction between the first inner sealing member (171) and guide (151), and the second inner sealing member (172) and guide (151), so the air between valve (15) and the guide (151) can be kept in tight.

[0036] The coupling (18) may be formed on the inside of the main body (11) and combined with a securing member (1200) that secures the piston (10). For example, the coupling (18) may contain internal thread formed on the inner face of the rear end of main body (11). In this case, the securing member (1200) may form an outer thread (1210) that engages the internal thread with the screw. If the user manually operates the centrifuge piston (10), the user can secure the valve (14) to the main body (11) by moving the securing member (1200) along the center axis (X) of the main body (11) towards the main body (11) and screwing the outer thread (1210) of the securing member (1200) and the inner thread of the coupling (18). Accordingly, fluid flow may be blocked from the front of the main body (11) to the rear of the main body (11) and the user may manually operate the piston (10).

[0037] The structure of the valve (14) shall be described in detail below, together with the coupling relationship of the valve (14), valve support (15), elastic member (16) and inner seal (17).

[0038] The valve (14) may contain valve body (141), depression (142), hollow (143), first inner recess (144) and second inner recess (145). The valve body (141) may be fitted with a central axis (X) that is coaxial to the main body (11). For example, the valve body (141) may be with a cylinder form. The depression (142) may be formed along the circumferential direction of the valve body (141), facing towards the inner center of the valve body (141). The second end of the elastic member (16) is located in the depression (142), so that the valve (14) can be elastically supported by the elastic member (16). The hollow (143) may be formed on the valve body (141) so that it penetrates the center of the valve body (141) from the front of the valve body (141) to the rear of the valve body (141). The hollow (143) may insert a guide (151) of the valve support (15). Accordingly, with the guide (151) inserted in the hollow (143), the valve body (141) can move in the direction of the length of the guide (151). The first inner recess (144) and the second inner recess (145) are formed on the inner face of the valve body (141), and the first inner sealing member (171) and the second inner sealing member (172) may be combined respectively.

[0039] The valve (14) may be equipped with a weight of a set size. The weight of the valve (14) may be set according to the magnitude of the external force, the elastic force applied by the elastic member (16) to the valve (14), and the friction between the valve (14) and the valve support (15), etc. The magnitude of the external force applied to the valve (14) and the friction between the valve (14) and the valve support (15) depends on the weight of the valve (14). For example, when moving the valve (14) forward of the main body (11), the external force acting on the valve (14) may be set to be greater than the magnitude of the elastic force acting on the valve (14) and the sum of the friction between the valve (14) and the valve support (15). Meanwhile, when moving the valve (14) backward of the main body (11), the external force acting on the valve (14) may be set to be smaller than the magnitude of the elastic force acting on the valve (14) and the sum of the friction between the valve (14) and the valve support (15).

[0040] Refer to FIG. 5 or FIG. 7 and explain the operation of the centrifugal piston (10) according to the first embodiment.

[0041] FIG. 5 shows the equilibrium state of force with no external force on the centrifugal piston (10) according to the embodiment. Since the elastic member (16) applies an elastic force to the valve (14), the valve (14) will attempt to move rearward of the main body (11) away from the inner end (115) of the main body (11). At this time, the flange (155) may restrict the movement of the valve (14) to prevent the valve (14) from leaving the outside the main body (11).

[0042] In this situation, of the compounds of biological tissue and body fluids which located in front of the main body (11) [0045], the smaller gravity and smaller sized biological tissue and fluids, etc. filtered by the mesh (133) and entered to the inlet (152), and it may block flow to the rear of the main body (11) along the flow (153) by the valve (14) blocking the outlet (154). The fluid seal is achieved between the valve (14) and the valve support (15) by means of the first inner sealing member (171) and the second inner sealing member (172) of inner seal (17).

[0043] FIG. 6 shows the external force, or centrifugal force, applied to the centrifugal piston (10) according to the embodiment, when the rotational center of the centrifugation is located at the rear of the main body (11). When the rotational center of the centrifugation is located at the rear of the main body (11), centrifugation causes centrifugal force to act as showed in FIG.6 on the piston (10) of FIG.5. If the magnitude of the centrifugal force is greater than the magnitude of the elastic force applied to the valve (14) and the sum of the friction between the valve support (15) and the inner seal (17), the valve (14) moves forward of the main body (11) along the length direction of the valve support (15), and the outlet (154) opens. Accordingly, the fluids entering the inlet (152) and flowing along the flow (153) moves to the rear of the main body (11) through the outlet (154). When centrifugation is completed and the centrifugal force is no longer applied to the piston (10), the valve (14) moves rearward of the main body (11) by the elastic force applied to the valve (14), and stopped by the flange (155), and the outlet (154) is blocked by the valve (14). (See piston (10) in FIG. 5)

[0044] FIG. 7 is an example of centrifugation of fat tissue among biological tissue. It shows the front of the piston (10) with blood, medical fluid and pure fat tissue remaining, and the rear of the piston (10) with only free oil remaining based on the centrifugal piston (10) placed inside the container (1100) after centrifugation is completed. When centrifugation is complete, the user can only obtain free oil if necessary. If the user wishes to obtain pure fat tissue, the user may remove the free oil and move the piston (10) forward of the container (1100) to leak blood and medical fluid to the front of the container (1100) and only obtain the remaining pure fat tissue.

[0045] In short, when a compound of biological tissue, blood and body fluids in placed in front of the piston (10) in the container and centrifuges are performed at a set rotational speed (RPM), the centrifugal force separates and accelerates the compound of biological tissue, blood and body fluids according to its weight, and when it exceeds the magnitude of a specific centrifugal force, the valve (14) will overcome the friction between the valve support (15) and inner seal (17) and the elastic force acting on the valve (14), and moves towards the direction where centrifugal force applied and the outlet (154) opens. Accordingly, among the biological tissue and body fluids separated by centrifugation, the biological tissue and fluids, which are smaller than the void of the mesh (133) and smaller gravity move rearward of the main body (11) and piston (10) move in the direction in which centrifugal forces act. Eventually based on the piston (10), a relatively small gravity and small size biological tissue and fluid are located at the rear of the piston (10), and a relatively big gravity and big size biological tissue and fluid are located at the front of the piston (10). At the end of centrifugation, the elastic force applied to the valve (14) moves the valve (14) to the rear of the main body (11), blocking the outlet (154). Afterwards, the desired biological tissue and body fluids can be collected separately from the separated biological tissue and body fluids in the container.

[0046] Refer to FIG. 8 or FIG. 13 and explain the structure and operation of the centrifugal piston (20) according to the second embodiment.

[0047] If you refer to FIG. 8 or FIG. 13, the centrifugal piston (20) according to the second embodiment may contain the main body (21) containing the first outer recess (211), the second outer recess (212), the end (213), the receptor (214), and the inner end (215) and having the central axis (X'), the outer seal (22) containing the first outer seal member (221) and the second outer seal member (222), the filter (23) containing the cover (231), the protrusion (232) and the mesh (233), the valve (24) containing the vale body (241), the depression (242), the hollow (243), the first inner recess (244) and the second inner recess (245), and the valve support (25) containing the guide (251), inlet (252), flow (253), outlet (254) and flange (255), and the inner seal (27) containing elastic member (26), the first inner seal member (271) and the second inner seal member (272), and coupling (28).

[0048] The centrifugal piston (20) according to the second embodiment may optionally limit the movement of the valve (24) to include valve movement restriction mechanisms that block the flow (253), even if external force is applied to the centrifugal piston (20). The valve movement restriction mechanism may include the tongue (216) and groove (246). The tongue (216) may be formed on the inner face of the main body (21) and may have features extending in the direction of length along the central axis (X'). The groove (246) may be formed on the outer face of the valve (24) along the axis direction of the center axis (X'). The width of the groove (246) may be greater than or substantially equal to the width of the tongue (216) so that the tongue (216) is receipted within the groove (246).

[0049] FIG. 10 or FIG. 11 shows the first state in which the tongue (216) and groove (246) are aligned. In this state, when external force is applied to the centrifugal piston (20), since the tongue (216) does not restrict the movement of the valve (24), the valve (24) is not fixed to the valve support (25) and can be moved forward and backward of the main body (21) along the guide (251) and both opening and closing of the flow (253) may be achieved. While the valve (24) is moving forward and backward of the main body (21), the groove (246) is guided by tongue (216) and can be moved along tongue (216).

[0050] FIG. 12 or FIG. 13 shows the second state in which the tongue (216) and groove (246) are misaligned. In this state, even if external force is applied to the centrifugal piston (20), since the tongue (216) does restrict the movement of the valve (24), the valve (24) does not move along the valve support (25) and the flow (253) remains blocked.

[0051] In the embodiment, valve movement restriction mechanism may include more protrusions (256) and concave (247) that snap each other. The protrusion (256) may be formed on the flange (255) so that it protrudes from the outer face of the flange (255). The concave (247) may be formed on the rear surface of the valve (24) so that it is recessed from the rear surface of the valve (24) to the inner surface of the valve (24). For example, the protrusions (256) and the concave (247) may be multiples. While the tongue (216) restricts the movement of the valve (24), the protrusion (256) formed on the flange (255) may be snapped on the concave (247) formed on the valve (24). According to this structure, if the user attempts to change the state of the centrifugal piston (20) from state 2 to state 1or from state 1 to state 2, the user can easily figure out whether the tongue (216) and groove (246) are aligned or misaligned through snap coupling between the protrusion (256) and concave (247).
Refer to FIG. 14 or FIG. 16 and explain the structure and operation of the centrifugal piston (30) according to the third embodiment.

[0052] If you refer to FIG. 14 or FIG. 16, the centrifugal piston (30) according to the third embodiment may contain the main body (31) containing the first outer recess (311), the second outer recess (312), the end (313), the receptor (314), and the inner end (315) and having the central axis (X'), the outer seal (32) containing the first outer seal member (321) and the second outer seal member (322), the filter (33) containing the cover (331), the protrusion (332) and the mesh (333), the valve (34) containing the vale body (341), the depression (342), the hollow (343), the first inner recess (344) and the second inner recess (345), and the valve support (35) containing the guide (351), inlet (352), flow (353), outlet (354) and flange (355), and the inner seal (37) containing elastic member (36), the first inner seal member (371) and the second inner seal member (372), and coupling (38).

[0053] The centrifugal piston (30) according to the third embodiment may optionally secure the valve (34) to the main body (31) to include locking mechanism that optionally opens or blocks the flow (353). In this case, the valve (34) may have cylindrical shape. The locking mechanism may include interlocking elements (316), first groove (346) and second groove (347). The interlocking element (316) may be formed on the inner face of the main body (31) so that it protrudes towards the center of the main body (31). The first groove (346) may be formed on the outer face of the valve (34) in the axial direction of the valve (34). The second groove may be formed on the outer face of the valve (34) in the circumferential direction of the valve (34). The first groove (346) and the second groove (347) may intersect each other. For example, the size of the interlocking element (316) may be smaller than or substantially equal to the size of the first groove (346) and the size of the second groove (347) so that the interlocking element (316) is receipted in the first groove (346) and the second groove (347), respectively.

[0054] When the interlocking element (316) is aligned with the first groove (346) and the external force is applied to the valve (34), the interlocking element (316) may be moved along the first groove (346) and the valve (34) may freely move forward and rearward of the main body (31) along the guide (351), and both open and block of the flow (353) are possible.

[0055] The user may apply external force to the valve (34) with a separate operation and moves it forward of the piston (30) and when the valve (34) and the receptor (314) are in contact, the valve (34) may be rotated against the central axis (X"). In this case, the interlocking element (316) may enter the second groove (347) which intersects the first groove (346) while the interlocking element (316) moves along the first groove (346). The interlocking element (316) entered into the second groove (347) moves along the second groove (347) and may be interlocked with the second groove (347). If this condition occurs, the valve (34) remains secured to the main body (31) because the interlocking element (316) in the second groove (347) restricts the movement of the valve (34) even if external force is applied to the valve (34) during centrifugation. Accordingly, the flow (353) may remain open.

[0056] As above, although the embodiments have been explained by limited embodiment and drawings, various modification and transformation can be made from the above description if the person has general knowledge in the relevant technical field. For example, appropriate results may be achieved even when the techniques descried are performed in a different order than the described methods, and/or the components of a described system, structure, device, circuit, etc. are combined or mixed in a different form than the described methods, or replaced or substituted by other components or equivalents.


Claims

1. Piston for centrifugation, comprises:

a main body;

a valves which can be moved forward and backward of the above main body from inside as external forces act; and

has a flow in which the fluid flows from the front of the main body above to the rear of the main body above, and includes valve support to guide the movement of the valves above from the inside of the above main body;

when external force is applied to the valves of the centrifugal piston, the valves may be move forward of the main body above and open the flow above, and if no external force is applied to the above valves, the valve may be move backwards of the main body above and block the flow above.


 
2. The piston according to claim 1, wherein
the piston contains more elastic members that support the valves above, said elastic members are located between the inner end of the main body above and the valves above;
when external force is applied to the valves above, the above elastic members will be compressed, and when no external force is applied to the valves above, the above elastic members may be extension.
 
3. The piston according to claim 2, wherein
A centrifugal piston that the weight of the above valve may be set according to the magnitude of the above external force, the elasticity of the above elastic members acting on the above valve and the friction between the above valve and the above valve support.
 
4. The piston according to claim 1, wherein
A centrifugal piston that the above valve support includes a guide that is aligned with the main body above with the same axis, an inlet formed at the end of one section of the guide above, and the outlet formed at the side of the guide above. The above flow may follow the above guide and lead from the above inlet to the above outlet.
 
5. The piston according to claim 4, wherein
the above centrifugal piston contains more first inner sealing members and secondary inner sealing members located between the above valve and the above valve support, a centrifugal piston that while the above flow are blocked, the above first inner sealing member may be located in one part of the above guide based on the above outlet, and the above secondary inner sealing member may be located in other parts of the above guide in relation to the above outlet.
 
6. Piston for centrifugation, comprises:

a main body with a central axis;

a valve having the same axis as the above central axis and moving forward and backward of the above main body along the center axis above;

a valve support equipped with a flow from the front of the main body above to the rear of the main body above which fluid flows, and the above flow is opened or closed by the movement of the valve above; and

the centrifugal piston further includes a restriction mechanism of valve movement to selectively block the flow above by selectively restricting the movement of the valves forward to the main body above or backward to the main body above.


 
7. The piston according to claim 6, wherein
the above restriction mechanism of valve movement may contain a tongue formed on the inner face of the main body and extending in length along the above center axis; and
a centrifugal piston that includes grooves formed on the outer face of the valve along the axis direction of the above center axis and constructed to receipt the above tongue.
 
8. The piston according to claim 7, wherein
the above restriction mechanism of valve movement,
contains more concave part formed on the rear surface of the valve above; and protrusion part formed on the above valve support;
said concave part and said protrusion part may be snapped each other.
 
9. Piston for centrifugation, comprises:
a main body with a central axis;
a valve having the same axis as the above central axis and moving forward and backward of the above main body from inside; and
said centrifugal piston further includes a locking mechanism which selectively opens or blocks the flow by fixing the above valve selectively to the above main body.
 
10. The piston according to claim 9, wherein
the above locking mechanism includes more,
an interlocking element formed on the inner face of the main body above so that it protrudes towards the center of the main body above;
the first groove formed on the outer face of the valve above in the axial direction of the above valve; and
the second groove formed on the outer face of the valve above in the circumference direction of the above valve and intersected with the first groove;
the centrifugal piston that the interlocking elements above may be moved along the first groove above and located in the second groove above and can be interlocked in the second groove above.
 




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Cited references

REFERENCES CITED IN THE DESCRIPTION



This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.

Patent documents cited in the description