WO2024242146A1 - 細胞吸引保持用ピペットおよび受精卵または胚からの細胞採取用器具 - Google Patents
細胞吸引保持用ピペットおよび受精卵または胚からの細胞採取用器具 Download PDFInfo
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- WO2024242146A1 WO2024242146A1 PCT/JP2024/018881 JP2024018881W WO2024242146A1 WO 2024242146 A1 WO2024242146 A1 WO 2024242146A1 JP 2024018881 W JP2024018881 W JP 2024018881W WO 2024242146 A1 WO2024242146 A1 WO 2024242146A1
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- tip
- pipette
- inclined surface
- cell suction
- cell
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
- C12M1/00—Apparatus for enzymology or microbiology
- C12M1/26—Inoculator or sampler
Definitions
- This relates to a cell suction and retention pipette used when collecting cells for preimplantation embryo chromosomal aneuploidy testing or during ICSI.
- PGT-A preimplantation genetic testing for aneuploidy
- the fertilized egg is cultured for 2-3 days, and after it divides into 4-8 blastomeres, or after it is cultured for 4-7 days, blastocysts or 1-3 of their blastomeres are taken and the chromosomal aneuploidy of the fertilized egg is tested. Only normal fertilized eggs are then transplanted into the mother's uterus, which is thought to reduce the miscarriage rate and increase the pregnancy rate.
- a micromanipulation system is used to perform operations under a microscope, such as injection of sperm and sperm cells into eggs, and injection of nuclei, cytoplasm and DNA into cells.
- ICSI intracytoplasmic sperm injection
- an egg is sucked and held by a suction pipette, and a microneedle (micropipette with a cutting edge) is inserted into the egg using a micromanipulator, and operations such as genetic recombination and micro-fertilization are performed on the egg. Even in the above operations, it is necessary to hold the egg securely.
- a typical suction pipette is shown in Fig. 11 of Japanese Patent Laid-Open No. 9-168382 (Patent Document 1).
- the pipette shown in Fig. 11 of Patent Document 1 is composed of a pipette body 4 made of a glass tube having an suction port 2 that opens to the outside and sucks and holds a manipulation target 1 such as a cell, a connection port that opens to the outside and is used to create a negative pressure, and an internal passage 3 that connects the suction port 2 and the connection port.
- the pipette is connected to a connection port side of the pipette body 4, for example, a so-called injector (configured like a syringe), and the injector is operated to draw negative pressure inside the internal passage 3 through the connection port.
- the operation object 1 such as a cell
- the suction port 2 As a result, as shown in Fig. 11, the operation object 1, such as a cell, is sucked and held by the suction port 2.
- a minute hollow needle (a micropipette with a cutting edge) 5 is inserted into the egg to inject sperm for fertilization, or if the operation object 1 is various cells, a needle 5 or the like is pierced into the operation object 1 to make a hole.
- the injector is operated to create positive pressure inside the internal passage 3 through the connection port, and the state of the operation object 1 being sucked and held by the suction port 2 is released.
- the pipette shown in Figure 1 of Patent Document 1 is provided with a surrounding wall 25a near the suction port 22 that suctions and holds the object to be manipulated 1 (e.g., an egg), which surrounds the periphery of the object to be manipulated 1 suction-held by the suction port 22 from the side in the direction in which the object to be manipulated 1 is suctioned by the suction port 22.
- the object to be manipulated 1 e.g., an egg
- cells can be aspirated and held by the aspirating pipette by discharging the cells near the tip opening of the surrounding wall 25a.
- strong suction is required, which may damage the cells.
- the cells when held, they may be pressed by the surrounding wall 25a, which may damage the cells.
- An object of the present invention is to provide a pipette for aspirating and holding cells, which allows easy cell aspirating operation with an aspirating pipette and reduces the possibility of damaging the cells.
- a fertilized egg or embryo is held in a suction pipette, and a portion of cells (specifically, a portion of trophectoderm cells) is collected from the held fertilized egg or embryo.
- An object of the present invention is to provide an instrument for collecting cells from a fertilized egg or embryo, which can easily separate aspirated cells from the aspirated fertilized egg or embryo.
- a pipette for suction and holding cells comprising a hollow main body and an inner cavity having a tip opening and a rear opening, the hollow main body comprising a tip, the tip comprising an inclined surface formed on the outer surface of the tip and inclined toward the tip extension line of the central axis of the inner cavity.
- An instrument for collecting cells from a fertilized egg or embryo comprising the above-mentioned cell suction and retention pipette and a cell suction and collection pipette, wherein the cell suction and collection pipette has a tip outer diameter smaller than the tip outer diameter of the cell suction and retention pipette, and is a hollow tubular body having a hollow main body, a tip opening, a base opening, and an inner cavity formed within the hollow main body, with the tip side portion of the inner cavity serving as a cell collection section.
- FIG. 1 is a front view of a cell suction and retention pipette according to an embodiment of the present invention.
- FIG. 2 is a plan view of the cell suction and holding pipette shown in FIG.
- FIG. 3 is a vertical cross-sectional view of the cell suction and holding pipette shown in FIG.
- FIG. 4 is an enlarged front view of the tip of the cell suction and holding pipette shown in FIG.
- FIG. 5 is an enlarged plan view of the tip of the cell suction and holding pipette shown in FIG.
- FIG. 6 is an enlarged right side view of the cell suction and holding pipette shown in FIG.
- FIG. 7 is an enlarged front view of the tip of a cell suction and holding pipette according to another embodiment of the present invention.
- FIG. 8 is a plan view of the cell suction and holding pipette shown in FIG.
- FIG. 9 is a right side view of the cell suction and holding pipette shown in FIG.
- FIG. 10 is an enlarged front view of the tip of a cell suction and holding pipette according to another embodiment of the present invention.
- FIG. 11 is a plan view of the cell suction and holding pipette shown in FIG.
- FIG. 12 is a right side view of the cell suction and holding pipette shown in FIG.
- FIG. 13 is an enlarged front view of the tip of a cell suction and holding pipette according to another embodiment of the present invention.
- FIG. 14 is a bottom view of the cell suction and holding pipette shown in FIG. FIG.
- FIG. 15 is a right side view of the cell suction and holding pipette shown in FIG.
- FIG. 16 is an enlarged right side view of the tip portion of a cell suction and holding pipette according to another embodiment of the present invention.
- FIG. 17 is a front view of a cell suction and retention pipette according to another embodiment of the present invention.
- FIG. 18 is an explanatory diagram for explaining the cell suction and holding operation using the cell suction and holding pipette of the present invention.
- FIG. 19 is an explanatory diagram for explaining the cell suction and holding operation using the cell suction and holding pipette of the present invention.
- FIG. 20 is an explanatory diagram for explaining the cell suction and holding operation using the cell suction and holding pipette of the present invention.
- FIG. 21 is a front view of a cell suction and retention pipette according to another embodiment of the present invention.
- FIG. 22 is an enlarged vertical cross-sectional view of the tip of the cell suction and holding pipette shown in FIG.
- FIG. 23 is an enlarged plan view of the tip of the cell suction and holding pipette shown in FIG.
- FIG. 24 is an enlarged right side view of the cell suction and holding pipette shown in FIG.
- FIG. 25 is a front view of one embodiment of a cell suction pipette used in the device for collecting cells from a fertilized egg or embryo of the present invention.
- FIG. 26 is a vertical cross-sectional view of the cell suction and collection pipette shown in FIG. FIG.
- FIG. 27 is an explanatory diagram for explaining the cell suction collection operation using the cell collection instrument from a fertilized egg or embryo of the present invention.
- FIG. 28 is an explanatory diagram for explaining the cell suction collection operation using the cell collection instrument from a fertilized egg or embryo of the present invention.
- FIG. 29 is an explanatory diagram for explaining the cell suction collection operation using the cell collection instrument from a fertilized egg or embryo of the present invention.
- FIG. 30 is an explanatory diagram for explaining the cell suction collection operation using the cell collection instrument from a fertilized egg or embryo of the present invention.
- FIG. 31 is an explanatory diagram for explaining the cell suction collection operation using the cell collection instrument from a fertilized egg or embryo of the present invention.
- the cell suction and holding pipette of the present invention will be described with reference to the embodiment shown in the drawings.
- the cell suction and retention pipette 1 of the present invention comprises a hollow main body portion 2 and an inner cavity portion 3 having a tip opening 31 and a rear opening 32, the hollow main body portion 2 comprises a tip portion 21, and the tip portion 21 comprises an inclined surface portion 4 formed on the outer surface of the tip portion 21 and inclined toward the tip side extension line direction of the central axis of the inner cavity portion 3.
- the cell suction and holding pipette 1 of the embodiment shown in Figs. 1 to 6 is a hollow tubular body having a hollow main body 2 and a lumen 3 formed within the hollow main body.
- the hollow body 2 is a straight tube that extends linearly with approximately the same outer diameter.
- the material for forming the hollow body 2 is glass or hard synthetic resin, and preferably transparent.
- glass include silicate-based materials (silicate glass).
- silicate glass include soda-lime glass, borosilicate glass, and quartz glass. Glass may also be made of a material other than silicate-based materials. Examples of such glass include acrylic glass, chalcogenide glass, metallic glass, and organic glass. In particular, borosilicate glass, which has little alkali elution, is preferable.
- Examples of hard synthetic resin include polyolefins such as high density polyethylene (HDPE) and polypropylene (PP), polystyrene, polyethylene terephthalate, and polycarbonate.
- the inner cavity 3 has a small inner diameter portion at the tip, and the tip 21 of the hollow main body 2 has a thick tip portion 5. Therefore, the inner diameter of the inner cavity 3 of the hollow main body 2 is not the same, but is narrowed at the tip.
- the inner diameter of the lumen 3 of the cell suction and retention pipette 1 narrows suddenly at the tip 21, and the tip of the lumen 3 has a narrowed diameter section and a short section of approximately the same inner diameter at its tip. Therefore, the tip 21 of the cell suction and retention pipette 1 has an annular thick-walled section 5.
- the inner diameter (opening diameter) of the tip opening 31 of the lumen 3 is smaller than the inner diameter (opening diameter) of the rear opening 32.
- the outer diameter of the hollow body 2 of the cell suction and retention pipette 1 is preferably 70 to 140 ⁇ m, and more preferably 80 to 130 ⁇ m.
- the inner diameter (opening diameter) of the tip opening 31 is preferably 10 to 40 ⁇ m, and more preferably 12 to 35 ⁇ m.
- the inner diameter (opening diameter) of the tip opening 31 is preferably 10 to 20 ⁇ m, and more preferably 12 to 18 ⁇ m. Furthermore, when the outer diameter (outer diameter of the tip of the hollow body) of the hollow body 2 of the cell suction and retention pipette 1 is 110 to 140 ⁇ m, the inner diameter (opening diameter) of the tip opening 31 is preferably 20 to 40 ⁇ m, and more preferably 25 to 35 ⁇ m.
- the cell suction and retention pipette 1 of the present invention is provided with an inclined surface portion 4 formed on the outer surface of the tip portion 21 of the hollow body portion 2, and inclined toward the tip extension line of the central axis of the lumen portion 3.
- the lumen portion 3 has a small inner diameter portion at the tip, and the tip portion 21 of the hollow body portion 2 has a thick tip portion 5.
- the inclined surface portion 4 is formed on the outer surface of the thick tip portion 5. Therefore, the tip portion 21 is not weakened due to the inclined surface portion 4, and the tip portion 21 of the hollow body portion 2 has sufficient strength.
- the inclined surface portion 4 is provided with a planar inclined surface 41, as shown in Figures 2, 5, and 6.
- the inclined surface portion is preferably planar.
- the planar inclined surface of the inclined surface portion may have a shape with a recessed center, such as the planar inclined surface 41c of the cell suction and retention pipette 1d of the embodiment shown in Figure 16.
- the shape with a recessed center may be such that the planar inclined surface 41 is inclined toward the center from both side edges 41a, 41b, or may be a gently concave curved surface.
- the flat inclined surface 41 is a substantially triangular inclined surface 41 that widens toward the tip of the hollow body 2 and extends to the tip.
- the sides 41a, 41b of the flat inclined surface 41 are preferably edgeless, and are preferably chamfered or rounded, for example.
- the axial length of the inclined surface portion 4 is preferably 40 to 160 ⁇ m, and more preferably 60 to 140 ⁇ m.
- the planar inclined surface 41 reaches the tip of the hollow main body 2 and is inclined at approximately the same angle.
- the inclination angle (R1 in Fig. 4) of the planar inclined surface 41 with respect to the central axis of the inner cavity 3 is preferably 10 to 50°. If it is 10° or more, it is possible to guide the cells placed on the inclined surface 4 toward the tip side of the pipette, and if it is 50° or less, it is possible to restrict the steep movement of the cells placed on the inclined surface 4. In particular, 15 to 45° is preferable. Furthermore, 18 to 40° is preferable. In addition, the inclination angle (R1 in Fig.
- the distance between the center of the tip 42 of the inclined surface portion 4 and the center of the cavity portion 3 (D1 in FIG. 4) is preferably 10 to 40 ⁇ m. Particularly, 15 to 35 ⁇ m is preferable.
- the distance between the center of the tip 42 of the inclined surface portion 4 and the upper end of the cavity portion 3 (D2 in FIG. 4) is preferably 7 to 35 ⁇ m. Particularly, 10 to 30 ⁇ m is preferable.
- the cell suction and retention pipette of the present invention may also have an inclined surface portion 4a as shown in Figs. 7 to 9.
- the inclined surface portion 4a has a substantially triangular inclined surface (flat inclined surface) 41 whose width increases toward the tip of the hollow main body, and further has a tip flat portion 43 formed at the tip of the inclined surface portion 4a and formed substantially parallel to the central axis of the lumen portion 3.
- the inclined surface portion 4a has a substantially triangular inclined surface 41 whose width increases toward the tip of the hollow main body, and a tip flat portion 43 formed substantially parallel to the central axis of the lumen portion 3 extending from the tip to the tip side, and the tip extends to the tip 42 of the pipette.
- the only difference between the cell suction and retention pipette 1 of the above embodiment and the cell suction and retention pipette 1a of this embodiment is the difference in the shape of the inclined surface portion.
- the axial length of the inclined surface portion 4a is preferably 40 to 160 ⁇ m, and more preferably 60 to 140 ⁇ m.
- the width of the tip flat portion 43 (the width perpendicular to the central axis of the pipette) is preferably 10 to 30 ⁇ m, and more preferably 15 to 25 ⁇ m.
- the inclination angle of the planar inclined surface 41 with respect to the central axis of the inner cavity 3 is preferably 10 to 50°. In particular, 15 to 45° is preferable. Furthermore, 18 to 40° is preferable. Furthermore, the distance between the center of the tip 42 of the inclined surface portion 4a and the center of the inner cavity 3 is preferably 10 to 40 ⁇ m. In particular, 15 to 35 ⁇ m is preferable. Furthermore, the distance between the center of the tip 42 of the inclined surface portion 4a and the upper end of the inner cavity 3 is preferably 7 to 35 ⁇ m. In particular, 10 to 30 ⁇ m is preferable.
- the cell suction and retention pipette of the present invention may also include an inclined surface portion 4b as shown in Figures 10 to 12.
- the inclined surface portion 4b includes an approximately triangular inclined surface 41 whose width increases toward the tip of the hollow main body portion 2, and further includes a tip steeply inclined portion 44 formed at the tip of the inclined surface portion 4b and inclined toward the tip side extension line direction of the central axis of the inner cavity portion 3 at a larger inclination angle than the inclination angle of the other parts of the approximately triangular inclined surface 41.
- the inclined surface portion 4b includes an approximately triangular inclined surface 41 whose width increases toward the tip of the hollow main body portion, and a tip steeply inclined portion 44 that extends from the tip toward the tip side and inclined toward the tip side extension line direction of the central axis of the inner cavity portion 3 at a larger inclination angle than the approximately triangular inclined surface 41.
- the tip steeply inclined portion 44 extends to the tip 42 of the pipette.
- the axial length of the inclined surface portion 4b is preferably 40 to 160 ⁇ m, and more preferably 60 to 140 ⁇ m.
- the width of the steeply inclined tip portion 44 (the width perpendicular to the central axis of the pipette) is preferably 10 to 30 ⁇ m, and more preferably 15 to 25 ⁇ m.
- the inclination angle of the planar inclined surface (approximately triangular inclined surface) 41 with respect to the central axis of the inner cavity 3 is preferably 10 to 50°. In particular, 15 to 45° is preferable. Furthermore, 18 to 40° is preferable.
- the distance between the center of the tip 42 of the inclined surface portion 4b and the center of the inner cavity 3 is preferably 10 to 40 ⁇ m. In particular, 15 to 35 ⁇ m is preferable.
- the distance between the center of the tip 42 of the inclined surface portion 4b and the upper end of the inner cavity 3 is preferably 7 to 35 ⁇ m. In particular, 10 to 30 ⁇ m is preferable.
- the inclination angle of the steeply inclined tip portion 44 with respect to the central axis of the inner cavity 3 is preferably 3 to 15° larger than the inclination angle of the planar inclined surface (approximately triangular inclined surface) 41, and is preferably 5 to 12°.
- the cell suction and retention pipette of the present invention may also be provided with multiple inclined surface portions 4, 40 that are inclined toward the extension line of the tip side of the central axis of the inner cavity 3, as shown in Figures 13 to 15.
- the cell suction and retention pipette 1c of this embodiment is provided with two inclined surface portions 4, 40.
- the two inclined surface portions 4, 40 are also provided so as to face each other with respect to the central axis of the inner cavity 3.
- the number of inclined surface portions may be two or more, with two or three being preferred.
- the only difference between the cell suction and retention pipette 1 of the above-mentioned embodiment and the cell suction and retention pipette 1c of this embodiment is the presence or absence of the second inclined surface portion 40.
- the inclined surface portion 4 is the same as that of the cell suction and retention pipette 1 of the above-mentioned embodiment.
- the second inclined surface portion 40 is also the same as the inclined surface portion 4 described above.
- the second inclined surface portion 40 is provided with a planar inclined surface 45.
- the planar inclined surface 45 is preferably planar, similar to the inclined surface portion 4 described above. However, it may be a gently curved surface. Furthermore, the curved surface may be a concavely curved surface or a convexly curved surface.
- the second inclined surface portion 40 is preferably flat. However, the flat inclined surface of the inclined surface portion may have a shape with a recessed central portion of the flat inclined surface 45, similar to the cell suction and retention pipette 1d of the embodiment shown in Fig. 16.
- the shape with a recessed central portion may be such that the flat inclined surface 45 is inclined from both side edges 45a, 45b toward the center, or may be a gently concave curved surface.
- the flat inclined surface 45 is a generally triangular inclined surface 45 that widens toward the tip of the hollow body 2 and extends to the tip.
- the sides 45a, 45b of the flat inclined surface 45 are preferably edgeless, and are preferably chamfered or rounded, for example.
- the axial length of the inclined surface portion 40 is preferably 40 to 160 ⁇ m, and more preferably 60 to 140 ⁇ m.
- the planar inclined surface 45 reaches the tip of the hollow main body 2 and is inclined at approximately the same angle.
- the inclination angle of the planar inclined surface 45 with respect to the central axis of the inner cavity 3 is preferably 10 to 50°. If it is 10° or more, it is possible to guide the cells placed on the inclined surface 40 toward the tip of the pipette, and if it is 50° or less, it is possible to regulate the steep movement of the cells placed on the inclined surface 40. In particular, 15 to 45° is preferable. Furthermore, 18 to 40° is preferable.
- the distance between the center of the tip 42a of the inclined surface 40 and the center of the inner cavity 3 is preferably 10 to 40 ⁇ m.
- the distance between the center of the tip 42a of the inclined surface 40 and the upper end of the inner cavity 3 is preferably 7 to 35 ⁇ m. In particular, 10 to 30 ⁇ m is preferred.
- the shape of the inclined surface portion 4, 40 may be the inclined surface portion 4a of the cell suction and retention pipette 1a shown in Figures 7 to 9, or the inclined surface portion 4b of the cell suction and retention pipette 1b of the embodiment shown in Figures 10 to 12.
- the hollow body 2a may have a bent portion 22, as in the cell suction and retention pipette 1e of the embodiment shown in FIG. 17.
- the bent portion 22 is provided at a position closer to the tip side than the center of the hollow body 2a.
- the bending angle of the bent portion 22 with respect to the central axis of the lumen 3 is preferably 10 to 50°, and more preferably 15 to 45°.
- the inclined surface portion 4 is provided at the tip portion 21 of the hollow body 2a, and on the inside in the bending direction of the bent portion 22.
- cells are aspirated using another pipette.
- the tip of the cell suction and retention pipette 1 is inserted into a petri dish (not shown) containing a culture medium.
- the tip of the pipette that has aspirated the cells is placed above the inclined surface portion 4 of the cell suction and retention pipette 1, and the cells 8 are released onto the inclined surface portion 4.
- the suction means (not shown) connected to the rear end of the cell suction and retention pipette 1 is operated.
- the released cells 8 move toward the tip on the inclined surface portion 4 and descend as shown in FIG. 19.
- the cells 8 that have moved below the tip 42 of the inclined surface portion 4 are aspirated and retained by the tip opening 31 of the cell suction and retention pipette 1.
- FIG. 21 A cell suction and holding pipette according to another embodiment of the present invention will be described with reference to FIGS. 21 and 22.
- FIG. The cell suction and retention pipette 1f of this embodiment like the cell suction and retention pipette 1 described above, comprises a hollow main body portion 2 and an inner cavity portion 3 having a tip opening 31 and a rear opening 32, and the hollow main body portion 2 comprises a tip portion 21a, which in turn comprises an inclined surface portion 4c formed on the outer surface of the tip portion 21a and inclined toward the tip side extension line of the central axis of the inner cavity portion 3.
- the basic configuration of the cell suction and retention pipette 1f of this embodiment is the same as that of the cell suction and retention pipette 1 described above, and the only difference is that the shape of the tip portion 21a is slightly different.
- a straight tube having substantially the same outer diameter and extending linearly is used as the hollow main body 2.
- the material for forming the hollow main body 2 is the same as that described for the cell suction and retention pipette 1.
- the inner cavity 3 has a small inner diameter portion at the tip, and the tip 21a of the hollow main body 2 has a thick-walled portion 5. Therefore, the inner diameter of the inner cavity 3 of the hollow main body 2 is not the same, but is narrowed at the tip.
- the tip 21a of the cell suction and retention pipette 1f has an annular thick-walled portion 5.
- the inner diameter (opening diameter) of the tip opening 31 of the lumen 3 is smaller than the inner diameter (opening diameter) of the rear opening 32.
- the cell suction and retention pipette 1f of this embodiment also has a tip lumen 33 in the tip 21a that is connected to the lumen 3 and has a small inner diameter.
- a tapered inner diameter reducing section is formed at the base end of the tip lumen 33, where the inner diameter rapidly reduces from the lumen 3 side toward the tip lumen 33.
- a tapered inner diameter expanding section 34 is formed at the tip of the tip lumen 33, where the inner diameter expands in a tapered manner toward the tip opening 31.
- the outer diameter of the hollow body 2 of the cell suction and retention pipette 1f is preferably 70 to 140 ⁇ m, and more preferably 80 to 130 ⁇ m.
- the inner diameter (opening diameter) of the tip opening 31 is preferably 10 to 40 ⁇ m, and more preferably 12 to 35 ⁇ m.
- the inner diameter (opening diameter) of the tip opening 31 is preferably 10 to 40 ⁇ m, and more preferably 12 to 35 ⁇ m.
- the inner diameter (opening diameter) of the tip opening 31 is preferably 10 to 20 ⁇ m, and more preferably 12 to 18 ⁇ m, when the outer diameter (outer diameter of the tip of the hollow body) of the cell suction and retention pipette 1f is 70 to 110 ⁇ m. Furthermore, the inner diameter (opening diameter) of the tip opening 31 is preferably 20 to 40 ⁇ m, and more preferably 25 to 35 ⁇ m, when the outer diameter (outer diameter of the tip of the hollow body) of the hollow body 2 of the cell suction and retention pipette 1f is 110 to 140 ⁇ m.
- the inner diameter of the smallest inner diameter portion of the tip lumen 33 is preferably 0.5 to 5 ⁇ m smaller than the inner diameter (opening diameter) of the tip opening 31, and is particularly preferably 0.8 to 3 ⁇ m smaller.
- the total length of the tip lumen 33 (the length from the tip opening 31 to the part of the tip lumen 33 whose inner diameter is the same as the inner diameter of the tip opening) is preferably 20 to 50 ⁇ m, and is particularly preferably 25 to 40 m.
- the length of the tapered inner diameter expansion portion 34 is preferably 10 to 40 ⁇ m, and is particularly preferably 15 to 35 ⁇ m.
- the cell suction and retention pipette 1f has an inclined surface 4c formed on the outer surface of the tip 21a of the hollow main body 2, which is inclined toward the tip extension line of the central axis of the lumen 3.
- the lumen 3 has a small inner diameter portion at the tip, and the tip 21a of the hollow main body 2 has a thick tip portion 5.
- the inclined surface 4c is formed on the outer surface of the thick tip portion 5. Therefore, the tip 21a is not weakened due to the inclined surface 4c, and the tip 21a of the hollow main body 2 has sufficient strength.
- the inclined surface portion 4c has a planar inclined surface 41, as shown in Figures 22 to 24. It is preferable that the inclined surface portion be planar.
- the flat inclined surface 41 is an approximately triangular inclined surface 41 that widens toward the tip of the hollow main body portion 2 and extends to the tip.
- the sides 41a, 41b of the flat inclined surface 41 are preferably edgeless, and are preferably chamfered or rounded, for example.
- the axial length of the inclined surface portion 4c is preferably 40 to 160 ⁇ m, and more preferably 60 to 140 ⁇ m.
- the axial length of the inclined surface portion 4c may also be 60 to 200 ⁇ m. In particular, 80 to 180 ⁇ m is preferred.
- the width of the inclined surface portion 4c at the tip varies depending on the outer diameter of the end of the pipette, but is preferably 65 to 120 ⁇ m, and more preferably 70 to 100 ⁇ m. Additionally, the width of the tip of the inclined surface portion 4c is preferably 50/100 to 80/100 of the outer diameter of the end of the pipette, and more preferably 60/100 to 75/100.
- the planar inclined surface 41 reaches the tip of the hollow main body 2 and is inclined at approximately the same angle.
- the inclination angle of the planar inclined surface 41 with respect to the central axis of the inner cavity 3 is preferably 5 to 30°. If it is 5° or more, it is possible to gently guide the cells placed on the inclined surface portion 4c toward the tip side of the pipette. In particular, 5 to 25° is preferable.
- the distance between the center of the tip 42 of the inclined surface portion 4c and the center of the inner cavity portion 3 is preferably 10 to 40 ⁇ m. In particular, 15 to 35 ⁇ m is preferable. Furthermore, the distance between the center of the tip 42 of the inclined surface portion 4c and the upper end of the inner cavity portion 3 (see D2 in FIG. 4) is preferably 7 to 35 ⁇ m. In particular, 10 to 30 ⁇ m is preferable.
- the inclined surface portion may have a tip flat portion 43 formed at the tip of the inclined surface portion and formed approximately parallel to the central axis of the inner cavity portion 3.
- the inclined surface portion has a substantially triangular inclined surface 41 whose width increases toward the tip of the hollow main body portion, and a tip flat portion 43 formed approximately parallel to the central axis of the inner cavity portion 3 extending from the tip toward the tip side, and the tip extends to the tip 42 of the pipette.
- the width of the tip flat portion 43 (the width perpendicular to the central axis of the pipette) is preferably 10 to 30 ⁇ m. In particular, 15 to 25 ⁇ m is preferable.
- the cell suction and retention pipette 1f of this embodiment may also be provided with multiple (specifically, two) inclined surface portions 4 that are inclined toward the extension line of the tip side of the central axis of the inner cavity 3, similar to the cell suction and retention pipette 1c shown in Figures 13 to 15.
- the two inclined surface portions are provided facing each other with respect to the central axis of the inner cavity 3.
- the number of inclined surface portions may be two or more, with two or three being preferred.
- the cell sampling device from a fertilized egg or embryo of the present invention comprises the above-mentioned cell suction and retention pipette and a cell suction and sampling pipette 10.
- the cell suction and sampling pipette 10 has a tip outer diameter smaller than the tip outer diameter of the cell suction and retention pipette, is a hollow tubular body, and comprises a hollow main body 11, a tip opening 14, a base end opening 15, and a lumen 13 formed within the hollow main body 11.
- the tip side portion of the lumen 13 serves as a cell sampling section 16.
- the tip 12 of the cell suction and sampling pipette 10 of this embodiment comprises a tapered portion that tapers toward the tip.
- the cell aspirating pipette is used to aspirate and collect a portion of cells from a fertilized egg or embryo (preferably an embryo).
- the cell suction sampling pipette 10 of the embodiment shown in Figures 25 and 26 is a hollow tubular body and includes a hollow main body 11, a lumen 13 formed within the hollow main body, a tip 12, a tip opening 14, a base opening 15, and a cell sampling portion 16 formed within the tip 12 (the tip portion of the lumen 13).
- the material for forming the hollow body 11 is preferably glass or hard synthetic resin, and is preferably transparent.
- glass include silicate-based materials (silicic acid glass).
- silicate glass include soda-lime glass, borosilicate glass, and quartz glass. Glass may also be made of a material other than silicate-based materials. Examples of such glass include acrylic glass, chalcogenide glass, metal glass, and organic glass. In particular, borosilicate glass, which is less susceptible to alkali elution, is preferable.
- hard synthetic resin include polyolefins such as high density polyethylene (HDPE) and polypropylene (PP), polystyrene, polyethylene terephthalate, and polycarbonate.
- the tip 12 of the cell suction sampling pipette 10 has a tapered portion that tapers toward the tip, as shown in Figures 25 and 26.
- the tip 12 of the cell suction sampling pipette 10 has both an outer diameter and an inner diameter that taper toward the tip.
- the cell suction sampling pipette 10 used has a tip outer diameter that is smaller than the tip outer diameter of the cell suction and retention pipette to be used.
- the outer diameter of the tip of the tip portion 12 of the cell aspirating pipette 10 (the outer diameter of the tip of the hollow body portion 11) is preferably 30 to 120 ⁇ m, and more preferably 40 to 90 ⁇ m.
- the outer diameter of the tip of the tip portion 12 of the cell aspirating pipette 10 is preferably 20 to 100 ⁇ m thinner than the outer diameter of the tip of the cell holding pipette to be used, and more preferably 30 to 85 ⁇ m thinner.
- the gradient angle (taper angle) of the reduced diameter portion of the tip 12 of the cell suction and collection pipette 10 is smaller than the gradient angle of the approximately triangular inclined surface of the cell suction and collection pipette with respect to the central axis of the inner cavity.
- the gradient angle (taper angle) of the reduced diameter portion of the tip 12 of the cell suction and collection pipette 10 is preferably 3 to 20°, and more preferably 5 to 10°.
- the gradient angle (taper angle) of the reduced diameter portion of the tip 12 of the cell suction and collection pipette 10 is preferably 2 to 10° smaller, and more preferably 3 to 8° smaller, than the gradient angle of the approximately triangular inclined surface of the cell suction and collection pipette with respect to the central axis of the inner cavity.
- the axial length of the reduced diameter portion of the tip 12 of the cell suction and collection pipette 10 is preferably 40 to 200 ⁇ m, and more preferably 60 to 180 ⁇ m.
- a fertilized egg or embryo (preferably an embryo) is sucked and held in the tip opening 31 of a cell suction and holding pipette 1f as shown in Fig. 20.
- the tip opening 14 of the tip 12 of the cell suction and collection pipette 10 is brought into contact with the embryo 8 held by the cell suction and holding pipette 1f, so that the embryo 8 is sandwiched between the tip of the cell suction and holding pipette 1f and the tip of the cell suction and collection pipette 10.
- the suction means (not shown) connected to the rear end of the cell suction and collection pipette 10 is operated, and some of the cells are sucked and collected from inside the embryo into the inside of the tip 12 of the cell suction and collection pipette 10 (cell collection section 16) as shown in Fig. 28.
- the suction and holding of the embryo 8 by the cell suction and holding pipette 10 is continued, and the embryo 8 is positioned on the inclined surface portion 4c of the cell suction and holding pipette 1f as shown in Fig. 29.
- the cell suction and holding pipette 10 is operated to move the embryo 8 toward the tip on the inclined surface portion 4c, and the lower part of the tip of the cell suction and holding pipette 10 is positioned above the upper part of the tip of the cell suction and holding pipette 1f.
- the lower part of the tip of the cell suction and holding pipette 10 is moved toward the lower part of the tip of the cell suction and holding pipette 1f.
- the embryo 8 is partially torn off (partially separated) as shown in Fig. 31, and some of the cells of the embryo 8 are collected in the tip of the cell suction and holding pipette 10 (cell collection portion 16).
- Some of the embryo cells obtained in this manner can be used for cell testing, specifically preimplantation embryo chromosomal aneuploidy testing to analyze genes.
- the cell suction and holding pipette of the present invention is as follows.
- a pipette for suction and holding cells comprising a hollow body and an inner cavity having a tip opening and a rear opening, the hollow body comprising a tip, the tip comprising an inclined surface formed on the outer surface of the tip and inclined toward the tip extension line of the central axis of the inner cavity.
- This pipette for suction and holding cells comprises a hollow body and an inner cavity having a tip opening and a rear opening, the hollow body having a tip portion which has an inclined surface formed on the outer surface of the tip portion and which is inclined toward the tip extension line of the central axis of the inner cavity. Therefore, by discharging the cells collected in the sampling pipette from the inclined surface of the cell suction and holding pipette, the discharged cells are guided to the inclined surface, move toward the tip of the cell suction and holding pipette, and then descend from the tip toward the tip surface. The descended cells are sucked and held at the tip opening of the pipette by the suction force applied to the cell suction and holding pipette. This makes it easy to perform the cell suction and holding task.
- the above embodiment may also be as follows.
- the instrument for collecting cells from a fertilized egg or embryo is as follows.
- An instrument for collecting cells from a fertilized egg or embryo comprising a cell suction and retention pipette described in any one of (1) to (7) above and a cell suction and collection pipette, wherein the cell suction and collection pipette has a tip outer diameter smaller than the tip outer diameter of the cell suction and retention pipette, and is a hollow tubular body having a hollow main body, a tip opening, a base opening, and an inner cavity formed within the hollow main body, and the tip side portion of the inner cavity serves as a cell collection section.
- the cells aspirated into the tip of the cell aspirating collection pipette can be easily separated into fertilized eggs or embryos and collected cells by using the inclined surface and tip of the cell aspirating and holding pipette and the tip of the cell aspirating collection pipette.
- the above embodiment may also be as follows.
- (9) The instrument for collecting cells from a fertilized egg or embryo according to (8) above, wherein the tip of the cell suction pipette is a tapered portion that decreases in diameter toward the tip.
- (10) An instrument for collecting cells from a fertilized egg or embryo as described in (9) above, wherein the inclined surface portion of the cell suction and retention pipette comprises a substantially triangular inclined surface whose width increases toward the tip of the hollow body portion, and the inclination angle of the reduced diameter portion of the tip portion of the cell suction and retention pipette is smaller than the inclination angle of the substantially triangular inclined surface of the cell suction and retention pipette with respect to the central axis of the inner cavity portion.
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Abstract
Description
PGT-Aは、授受精卵を2~3日間培養し、授受精卵が4~8個の割球に分裂した後、あるいは、4~7日間培養し、胚盤胞もしくはその割球を1~3個採取して、授受精卵の染色体の異数性の検査をする。そして、正常な授受精卵のみを母体の子宮に移植するため、流産率を下げ、妊娠率を上げることが可能になると考えられる。
PGT-Aを行うためには、胚盤胞もしくはその割球を吸引ピペットにて保持し、保持された胚盤胞もしくはその割球より、栄養外胚葉細胞の一部(5~10細胞程度)を採取することが必要である。上記細胞採取操作では、胚盤胞もしくはその割球を確実に保持することが必要である。
そして、ICSI(細胞質内精子注入法)では、卵子を吸引ピペットにて、吸引保持した状態で、マイクロマニピュレータを用いて微小針(刃先付マイクロピペット)を卵子に穿刺し、卵子に対して遺伝子組み換え操作や顕微受精操作等の操作が行われる。上記操作においても、卵子を確実に保持することが必要である。
このピペットは、ピペット本体4の接続口側部分を例えばいわゆるインジェクタ(注射器のように構成されたもの)に接続し、インジェクタを操作して接続口を介して内部通路3内を負圧に引く。その結果、図11に示すように、細胞等の操作対象1が吸引口2に吸引保持される。そして、この状態において、例えば、操作対象1が卵子である場合には卵子に微小中空針(刃先付マイクロピペット)5を差し込んで精子を注入して受精を行ったり、操作対象1が種々の細胞などである場合に操作対象1に針5などを刺して穴を開けたりするなどの、種々の操作を行う。なお、このような操作の終了後には、インジェクタを操作して接続口を介して内部通路3内を正圧にし、吸引口2による操作対象1の吸引保持の状態を解除する。
また、特許文献1の図1に図示されているピペットは、操作対象1(例えば、卵子)を吸引保持する吸引口22付近に、吸引口22に吸引保持された操作対象1の周囲を吸引口22による操作対象1の吸引方向に対する側方から取り囲む囲み壁25aを備えている。
特許文献1の図1の吸引ピペットでは、取り囲む囲み壁25aの先端開口付近にて、細胞を吐出することにより、吸引ピペットでの吸引保持が可能である。しかし、取り囲む囲み壁25aの先端開口とピペット本体の先端開口間に距離があるため、強い吸引を行うことが必要であり、細胞に損傷を与える可能性がある。また、特許文献1の図1のように、細胞を保持した状態にて、取り囲む囲み壁25aにより押圧されることがあり、細胞に損傷を与える可能性がある。
また、受精卵および胚の染色体の異常を検査するために、受精卵または胚を吸引ピペットにて保持し、保持された受精卵または胚より、細胞の一部(具体的には、栄養外胚葉細胞の一部)を採取する。この採取操作は、吸引保持ピペットにて、受精卵または胚を保持した状態にて、細胞採取用ピペットの先端部を受精卵または胚に当接させ、吸引することにより、受精卵または胚の細胞の一部を採取したのち、吸引した細胞を吸引元である受精卵または胚より分離することにより行われる。
本発明の目的は、吸引した細胞を吸引元である受精卵または胚より分離する操作を容易に行うことができる受精卵または胚からの細胞採取用器具を提供する。
細胞吸引保持用ピペットであって、前記細胞吸引保持用ピペットは、中空本体部と、先端開口部と後端開口部とを有する内腔部を備え、前記中空本体部は、先端部を備え、前記先端部は、前記先端部の外面に形成され、前記内腔部の中心軸の先端側延長線方向に向かって傾斜する傾斜面部を備えている細胞吸引保持用ピペット。
上記の細胞吸引保持用ピペットと、細胞吸引採取用ピペットとからなる受精卵または胚からの細胞採取用器具であって、前記細胞吸引採取用ピペットは、前記細胞吸引保持用ピペットの先端部外径より、小さい先端部外径を備え、かつ、中空管状体であり、中空本体部と、先端開口と、基端開口と、前記中空本体部内に形成された内腔部とを備え、前記内腔部の先端側部分が細胞採取部となっている受精卵または胚からの細胞採取用器具。
本発明の細胞吸引保持用ピペット1は、中空本体部2と、先端開口部31と後端開口部32とを有する内腔部3とを備え、中空本体部2は、先端部21を備え、先端部21は、先端部21の外面に形成され、内腔部3の中心軸の先端側延長線方向に向かって傾斜する傾斜面部4を備えている。
図1ないし図6に示す実施例の細胞吸引保持用ピペット1は、中空本体部2と、中空本体部内に形成された内腔部3を備える中空管状体である。
この実施例では、平面状傾斜面41は、中空本体部2の先端に向かって幅が広がり、かつ、先端まで延びる略三角形状傾斜面41となっている。平面状傾斜面41の側辺41a,41bは、エッジがないものが好ましく、例えば、面取りされたもの、丸みを付けたものが好適である。傾斜面部4の軸方向長は、40~160μmであることが好ましく、特に、60~140μmが好ましい。
また、傾斜面部4の先端42の中央部と内腔部3の中心部間距離(図4におけるD1)は、10~40μmであることが好ましい。特に、15~35μmが好ましい。また、傾斜面部4の先端42の中央部と内腔部3の上端間距離(図4におけるD2)は、7~35μmであることが好ましい。特に、10~30μmが好ましい。
なお、第2の傾斜面部40は、平面状であることが好ましい。しかし、傾斜面部の平面状傾斜面は、図16に示す実施例の細胞吸引保持用ピペット1dと同様に、平面状傾斜面45中央部が窪んだ形状であってもよい。中央部が窪んだ形状としては、平面状傾斜面45が、両側辺45a,45bから中央側に傾斜しているもの、緩やかな凹状湾曲面となっているものであってもよい。
この実施例では、平面状傾斜面45は、中空本体部2の先端に向かって幅が広がり、かつ、先端まで延びる略三角形状傾斜面45となっている。平面状傾斜面45の側辺45a,45bは、エッジがないものが好ましく、例えば、面取りされたもの、丸みを付けたものが好適である。傾斜面部40の軸方向長は、40~160μmであることが好ましく、特に、60~140μmが好ましい。
最初に、細胞を別のピペットを用いて、吸引採取する。そして、培養液が収納されているシャーレ(図示せず)内に細胞吸引保持用ピペット1の先端部を挿入する。続いて、図18に示すように、細胞を吸引採取したピペットの先端を、細胞吸引保持用ピペット1の傾斜面部4の上方に配置し、傾斜面部4上に細胞8を放出する。そして、細胞吸引保持用ピペット1の後端部に接続されている吸引手段(図示せず)を作動させる。放出された細胞8は、図19に示すように、傾斜面部4上を先端方向に移動するとともに下降する。そして、図20に示すように、傾斜面部4の先端42より下方に移動した細胞8は、細胞吸引保持用ピペット1の先端開口部31に吸引保持される。
この実施例の細胞吸引保持用ピペット1fにおいても、上述した細胞吸引保持用ピペット1と同様に、中空本体部2と、先端開口部31と後端開口部32とを有する内腔部3とを備え、中空本体部2は、先端部21aを備え、先端部21aは、先端部21aの外面に形成され、内腔部3の中心軸の先端側延長線方向に向かって傾斜する傾斜面部4cを備えている。
この実施例の細胞吸引保持用ピペット1fの基本構成は、上述した細胞吸引保持用ピペット1と同じであり、相違点は、先端部21aの形態が、若干異なるのみである。
そして、この実施例の細胞吸引保持用ピペット1fでは、内腔部3は、先端内径小径部を備え、中空本体部2の先端部21aは、先端肉厚部5を備えている。このため、中空本体部2の内腔部3の内径は同一ではなく、その先端部において、小径化している。
本発明の受精卵または胚からの細胞採取用器具は、上述した細胞吸引保持用ピペットと、細胞吸引採取用ピペット10とからなる。細胞吸引採取用ピペット10は、図25および図26に示すように、細胞吸引保持用ピペットの先端部外径より、小さい先端部外径を備え、かつ、中空管状体であり、中空本体部11と、先端開口14と、基端開口15と、中空本体部11内に形成された内腔部13とを備える。そして、内腔部13の先端側部分が細胞採取部16となっている。また、この実施例の細胞吸引採取用ピペット10の先端部12は、先端に向かってテーパー状に縮径する縮径部を備えている。
図25および図26に示す実施例の細胞吸引採取用ピペット10は、中空管状体であり、中空本体部11と、中空本体部内に形成された内腔部13と、先端部12と、先端開口14と、基端開口15と、先端部12内(内腔部13の先端側部分)に形成された細胞採取部16とを備え。
中空本体部11の形成材料としては、ガラス、硬質合成樹脂であり、透明性を有するものが好適である。ガラスとしては、ケイ酸塩を主成分とするもの(ケイ酸ガラス)を挙げることができる。ケイ酸ガラスとしては、例えば、ソーダ石灰ガラス、ホウケイ酸ガラス及び石英ガラスが挙げられる。また、ガラスは、ケイ酸塩以外の成分を主成分とするものであってもよい。このようなものとしては、例えば、アクリルガラス、カルコゲン化物ガラス、金属ガラス及び有機ガラスが挙げられる。特に、アルカリ溶出が少ないホウケイ酸ガラスが好適である。硬質合成樹脂としては、高密度ポリエチレン(HDPE)、ポリプロピレン(PP)などのポリオレフィン、ポリスチレンと、ポリエチレンテレフタレート、ポリカーボネートなどが挙げられる。
最初に、図20に示すような細胞吸引保持用ピペット1fの先端開口部31に、受精卵または胚(好ましくは、胚)吸引保持した状態となったものを準備する。そして、図27に示すように、細胞吸引保持用ピペット1fにより保持された胚8に、細胞吸引採取用ピペット10の先端部12の先端開口14を当接させ、胚8が、細胞吸引保持用ピペット1fの先端と細胞吸引採取用ピペット10の先端間により、挟まれた状態とする。そして、細胞吸引採取用ピペット10の後端に接続された吸引手段(図示せず)を作動させて、図28に示すように、胚の内部より、その細胞の一部を細胞吸引採取用ピペット10の先端部12の内部(細胞採取部16)に吸引採取する。
そして、このようにして得られた胚の細胞の一部は、細胞検査、具体的には、遺伝子を解析する着床前胚染色体異数性検査に用いることができる。
(1)細胞吸引保持用ピペットであって、前記細胞吸引保持用ピペットは、中空本体部と、先端開口部と後端開口部とを有する内腔部を備え、前記中空本体部は、先端部を備え、前記先端部は、前記先端部の外面に形成され、前記内腔部の中心軸の先端側延長線方向に向かって傾斜する傾斜面部を備えている細胞吸引保持用ピペット。
このため、採取用ピペット内に採取した細胞を、細胞吸引保持用ピペットの傾斜面部にて吐出させることにより、吐出された細胞は、傾斜面部に誘導され、細胞吸引保持用ピペットの先端方向に移動し、続いて、先端より先端面方向に下降する。下降した細胞は、細胞吸引保持用ピペットに付与される吸引力により、ピペットの先端開口部に吸引保持される。よって、細胞の吸引保持作業を容易に行うことができる。
(2)前記内腔部は、先端内径小径部を備え、前記中空本体部の前記先端部は、先端肉厚部を備え、前記傾斜面部は、前記先端肉厚部の外面に形成されている上記(1)に記載の細胞吸引保持用ピペット。
(3)前記傾斜面部は、前記中空本体部の先端に向かって幅が広がる略三角形状傾斜面を備えている上記(1)または(2)に記載の細胞吸引保持用ピペット。
(4)前記略三角形状傾斜面は、平面状であり、かつ、前記内腔部の中心軸に対する傾斜角度は、10~50°である上記(3)に記載の細胞吸引保持用ピペット。
(5)前記略三角形状傾斜面は、前記中空本体部の先端まで、ほぼ同じ角度にて傾斜している上記(3)または(4)に記載の細胞吸引保持用ピペット。
(6)前記傾斜面部は、前記中空本体部の先端に向かって幅が広がる略三角形状傾斜面を備え、さらに、前記傾斜面部の先端部に形成され、前記内腔部の中心軸とほぼ平行に形成された先端平坦部を備えている上記(1)または(2)に記載の細胞吸引保持用ピペット。
(7)前記傾斜面部は、前記中空本体部の先端に向かって幅が広がる略三角形状傾斜面を備え、さらに、前記傾斜面部の先端部に形成され、前記略三角形状傾斜面の他の部分の傾斜角度より大きい傾斜角度にて前記内腔部の中心軸の先端側延長線方向に向かって傾斜する先端急傾斜部を備えている上記(1)または(2)に記載の細胞吸引保持用ピペット。
(8) 上記(1)から(7)のいずれかに記載の細胞吸引保持用ピペットと、細胞吸引採取用ピペットとからなる受精卵または胚からの細胞採取用器具であって、前記細胞吸引採取用ピペットは、前記細胞吸引保持用ピペットの先端部外径より、小さい先端部外径を備え、かつ、中空管状体であり、中空本体部と、先端開口と、基端開口と、前記中空本体部内に形成された内腔部とを備え、前記内腔部の先端側部分が細胞採取部となっている受精卵または胚からの細胞採取用器具。
(9) 前記細胞吸引採取用ピペットの先端部は、先端に向かってテーパー状に縮径する縮径部となっている上記(8)に記載の受精卵または胚からの細胞採取用器具。
(10) 前記細胞吸引保持用ピペットの前記傾斜面部は、前記中空本体部の先端に向かって幅が広がる略三角形状傾斜面を備え、前記細胞吸引採取用ピペットの前記先端部の前記縮径部の勾配角度は、前記細胞吸引保持用ピペットの前記略三角形状傾斜面の前記内腔部の中心軸に対する傾斜角度より、小さいものとなっている上記(9)に記載の受精卵または胚からの細胞採取用器具。
Claims (10)
- 細胞吸引保持用ピペットであって、
前記細胞吸引保持用ピペットは、中空本体部と、先端開口部と後端開口部とを有する内腔部を備え、前記中空本体部は、先端部を備え、前記先端部は、前記先端部の外面に形成され、前記内腔部の中心軸の先端側延長線方向に向かって傾斜する傾斜面部を備えていることを特徴とする細胞吸引保持用ピペット。 - 前記内腔部は、先端内径小径部を備え、前記中空本体部の前記先端部は、先端肉厚部を備え、前記傾斜面部は、前記先端肉厚部の外面に形成されている請求項1に記載の細胞吸引保持用ピペット。
- 前記傾斜面部は、前記中空本体部の先端に向かって幅が広がる略三角形状傾斜面を備えている請求項1または2に記載の細胞吸引保持用ピペット。
- 前記略三角形状傾斜面は、平面状であり、かつ、前記内腔部の中心軸に対する傾斜角度は、10~50°である請求項3に記載の細胞吸引保持用ピペット。
- 前記略三角形状傾斜面は、前記中空本体部の先端まで、ほぼ同じ角度にて傾斜している請求項4に記載の細胞吸引保持用ピペット。
- 前記傾斜面部は、前記中空本体部の先端に向かって幅が広がる略三角形状傾斜面を備え、さらに、前記傾斜面部の先端部に形成され、前記内腔部の中心軸とほぼ平行に形成された先端平坦部を備えている請求項1または2に記載の細胞吸引保持用ピペット。
- 前記傾斜面部は、前記中空本体部の先端に向かって幅が広がる略三角形状傾斜面を備え、さらに、前記傾斜面部の先端部に形成され、前記略三角形状傾斜面の他の部分の傾斜角度より大きい傾斜角度にて前記内腔部の中心軸の先端側延長線方向に向かって傾斜する先端急傾斜部を備えている請求項1または2に記載の細胞吸引保持用ピペット。
- 前記請求項1から7のいずれかに記載の細胞吸引保持用ピペットと、細胞吸引採取用ピペットとからなる受精卵または胚からの細胞採取用器具であって、前記細胞吸引採取用ピペットは、前記細胞吸引保持用ピペットの先端部外径より、小さい先端部外径を備え、かつ、中空管状体であり、中空本体部と、先端開口と、基端開口と、前記中空本体部内に形成された内腔部とを備え、前記内腔部の先端側部分が細胞採取部となっていることを特徴とする受精卵または胚からの細胞採取用器具。
- 前記細胞吸引採取用ピペットの先端部は、先端に向かってテーパー状に縮径する縮径部となっている請求項8に記載の受精卵または胚からの細胞採取用器具。
- 前記細胞吸引保持用ピペットの前記傾斜面部は、前記中空本体部の先端に向かって幅が広がる略三角形状傾斜面を備え、前記細胞吸引採取用ピペットの前記先端部の前記縮径部の勾配角度は、前記細胞吸引保持用ピペットの前記略三角形状傾斜面の前記内腔部の中心軸に対する傾斜角度より、小さいものとなっている請求項9に記載の受精卵または胚からの細胞採取用器具。
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| EP24811152.8A EP4715036A1 (en) | 2023-05-23 | 2024-05-22 | Pipette for suctioning/holding cells, and instrument for collecting cells from fertilized egg or embryo |
| JP2025522436A JPWO2024242146A1 (ja) | 2023-05-23 | 2024-05-22 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09168382A (ja) | 1995-10-20 | 1997-06-30 | Nikon Corp | ピペット及びピペット製造方法 |
| JP2022131352A (ja) * | 2021-02-26 | 2022-09-07 | 日本精工株式会社 | 細胞塊の採取装置及び細胞塊の採取方法 |
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- 2024-05-22 WO PCT/JP2024/018881 patent/WO2024242146A1/ja not_active Ceased
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- 2024-05-22 EP EP24811152.8A patent/EP4715036A1/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09168382A (ja) | 1995-10-20 | 1997-06-30 | Nikon Corp | ピペット及びピペット製造方法 |
| JP2022131352A (ja) * | 2021-02-26 | 2022-09-07 | 日本精工株式会社 | 細胞塊の採取装置及び細胞塊の採取方法 |
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