JP2019111500A - Pipette device - Google Patents

Abstract

To provide a pipette device which can fix a ring for adjusting a suction gathering amount to stop rotation only when a user presses a pressing part to discharge a suctioned liquid and release fixation when the discharge of the liquid ends.SOLUTION: A pipette device has: a rotary ring part 27 which rotates to adjust an amount of a liquid that is suctioned or discharged by a user; a case part 40 which houses the rotary ring part 27 therein; and a ring fixing part 28 which is disposed in the case part 40 and prevents rotation of the rotary ring part 27. The user grips the case part 40 to press the ring fixing part 28. Then, the ring fixing part 28 contacts with the rotary ring part 27 to prevent the rotation of the rotary ring part 27.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pipette device capable of sucking and holding a liquid according to the movement of a piston and further discharging the liquid.

  As such a pipette device, a micropipette device provided with a removal means for removing and discarding the pipette tip disposed at the tip of the pipette device after use in Patent No. 4989133 and the like owned by the present applicant as such a pipette device Is disclosed.

  Thus, the pipette regulates the amount of liquid aspirated and also evacuated by moving the notches of the knurled rotary ring. That is, as described later, the pipette device sucks the liquid into the pipette tip removably disposed at the tip thereof by the movement of the piston portion. In the piston cylinder portion, a packing portion having an annular shape, that is, a ring shape and having a hole-like annular inner portion is disposed in the piston cylinder portion, and the piston portion slides in the annular inner portion of the packing portion Aspirate.

  However, when discharging the aspirated liquid, the liquid is discharged by pressing the pressing part, but when the aspirating, the user touches the knurled rotary ring that defines the suction amount set in advance, and the ring May rotate. If this ring rotates unexpectedly, the amount of suction to be set at that time changes, which may result in the amount of suction unintended by the user, which is extremely inconvenient.

  In order to solve this problem, in Japanese Patent No. 5657861, a knurled rotary ring is provided which is fitted on a common shaft with a rotary digital meter to adjust and set the amount of suctioned and collected liquid to be collected. A micropipette device, wherein the knurls of the knurled rotary ring are lightly locked to at least one projecting inner corner of the window edge of the pipette housing to release naturally with the projecting inner corner A pipette device is disclosed, which functions as a light stopper that can be released without finger movement.

  However, the light stopper is not released naturally, and the knurled rotary ring is always lightly engaged with at least one projecting inner corner of the window edge of the pipette housing. The problem is that it is difficult to adjust the amount of suctioned and collected liquid to be collected. In addition, the light stopper is not automatically released when it is not necessary as described above.

Patent No. 4989133 Patent No. 5657861 gazette

  The present invention has been made in view of the above-mentioned point, and the problem is to fix the rotation of the ring for adjusting the amount of suctioned collection only when pushing the pressing part to discharge the suctioned liquid, An object of the present invention is to provide a pipette device which can release its fixation when the discharge of the liquid is completed.

  As a result of keen research and development, in order to solve the above-mentioned problems, the pipette device of the first aspect has a rotating ring portion which rotates to adjust the amount of suction and discharge of the liquid by the user, and the rotating ring portion inside And a ring fixing portion disposed in the case for preventing rotation of the rotating ring portion, the user holding the case portion allows the user to hold the ring fixing portion. By pressing the ring fixing portion in contact with the rotating ring portion, the rotation of the rotating ring portion is prevented.

  In the pipette device of the second aspect, in the first aspect, the ring fixing portion is elastically connected to the case portion.

  Further, in the pipette device of the third aspect, in the first aspect or the second aspect, the ring fixing portion is disposed in the direction of the front end portion of the case portion.

  Since the present invention is configured and operates as described above, when pushing the pressing part to discharge the aspirated liquid, the rotation of the ring for adjusting the aspirated collection amount is fixed only at that time, It is possible to provide a pipette device capable of releasing the fixation when the discharge of the liquid is completed.

The perspective view of a pipette device. A is a longitudinal sectional view of the pipette device. B is a IIB-IIB line sectional view of A. FIG. The longitudinal cross-sectional enlarged view of the case part in a pipette apparatus. a is a state figure in which the knob part is arrange | positioned downward in the window part. b is a state figure in which the knob part is arrange | positioned in the window part in the middle. c is a state figure in which the knob part is arrange | positioned upwards in the window part. The longitudinal cross-sectional enlarged view of the case part in a pipette apparatus. The longitudinal cross-sectional enlarged view of the piston accommodating part in a pipette apparatus. The longitudinal cross-sectional view by which the knob part is arrange | positioned rightward in the 2nd window part in a pipette apparatus. The longitudinal cross-sectional view by which the knob part is arrange | positioned leftward in the 2nd window part in a pipette apparatus.

  The pipette device 10 of the present embodiment will be described. The pipette device 10 in the present embodiment includes a rotary ring 27 which rotates to adjust the amount of suction and discharge of the liquid by the user, a case 40 for housing the rotary ring 27 therein, and And a ring fixing portion 28 disposed in the case portion 40 for blocking the rotation of the rotation ring portion 27.

  The case unit 40 is for the user (not shown) to hold. Further, the pressing portion 20 disposed in the upper end portion direction U of the case portion 40 for the user to press, the piston rod portion 30 connected to the pressing portion 20, and the piston rod portion 30 are connected to It has a piston unit 50 movable for suction and a piston housing unit 70 housing the piston unit 50.

  The ring fixing portion 28 is disposed in the synthetic resin case portion 40 as described above. In the present embodiment, the ring fixing portion 28 constitutes a part of the case portion 40. That is, the ring fixing portion 28 having elasticity can also be configured by inserting the notches 28 a in a part of the case portion 40 made of synthetic resin. Therefore, by pressing the ring fixing portion 28, the ring fixing portion 28 presses the rotating ring portion 27 by elastically deforming the connection portion 28 b with the case portion 40 near the root of the ring fixing portion 28. it can. That is, the ring fixing portion 28 is pressed and the pressed ring fixing portion 28 ′ can prevent the rotation of the rotary ring portion 27 and stop the rotation (see FIGS. 2 and 3). As a result, the suction amount once set does not change, and if the pressing unit 20 is pressed in this state, the suctioned amount of liquid can be discharged. The pressed ring fixing portion 28 'in a state in which the ring fixing portion 28 is pressed is indicated by a broken line in FIGS. 2 and 3.

  When the pipette device 10 of this embodiment is used, it is used with the upper end direction U facing up and the front end direction F facing the front of the user (not shown). In other words, with the lower end direction D down, the rear end direction R is directed to the front side of the user, and the case 40 is gripped and used. As a result, if the ring fixing portion 28 is disposed in the front end direction F in the case portion 40, the user's finger is automatically applied to hold the case portion 40, and at the same time, the ring fixing portion 28 is pressed and pressed. The fixed ring fixing portion 28 ′ can block the rotation of the rotating ring portion 27. As a result, the suction amount once set does not change as described above. In addition, when the user's finger is released from the case portion 40, the pressing of the ring fixing portion 28 is automatically eliminated, and the rotating ring portion 27 becomes rotatable. Therefore, the set suction amount can be changed. Further, in order to discharge the atmosphere X generated from the liquid medicine sucked by the piston unit 50 to the outside, the user has a vent hole 49 in the case unit 40 for gripping.

  Also, the pipette tip 80 is arranged to be removable. Furthermore, the centers of the pressing portion 20, the piston rod portion 30, the piston rod portion 30, the case portion 40, the packing portion 60, the piston storage portion 70, and the piston portion 50 are disposed on the same line. There is.

  The pressing unit 20 is for performing an operation of pressing for discharging the liquid literally as described later. The pressing portion 20 has a long shaft portion 21 and a disc-like knob portion 22 in the upper end direction U, and has a convex and concave portion 23 in which a concavo-convex portion is disposed at an edge portion of the knob portion 22 There is. The convex and concave portions 23 are provided as slip stoppers when the shaft portion 21 is rotated about the axis, as described later. In addition, a long hollow cylindrical tube portion 26 is provided, and the long shaft portion 21 is disposed inside the tube portion 26. The rotation of the shaft 21 around its axis is fixed so as to be synchronized with the cylindrical portion 26 (not shown), and when the shaft 21 is rotated about the axis by one rotation, the cylindrical portion 26 is similarly rotated around the shaft 21. Make one rotation.

  Thus, although the cylindrical portion 26 rotates around the axis, the cylindrical portion 26 is formed with the internal thread portion 41a inside the case portion 40, and the external thread portion 26a is also formed in the cylindrical portion 26, Are screwed together. That is, they mesh with each other. Therefore, when the shaft portion 21 is rotated about the axis, the cylindrical portion 26 is also rotated, and the shaft portion 21 is moved relative to the cylindrical portion 26 in the lower end direction D. Conversely, when the shaft 21 is rotated, the shaft 21 moves relative to the cylindrical portion 26 in the upper end direction U. As a result, as will be described later, the piston portion 50 is lowered in the lower end direction D or raised in the upper end direction U by the piston rod portion 30 connected to the shaft portion 21 to increase or decrease the amount of liquid to be sucked. It can be adjusted. This will be further described later.

  The piston rod portion 30 is disposed inside the case portion 40. Further, the piston rod portion 30 has a piston shaft portion 31 and a thick shaft upper end portion 32. The thick upper end portion 32 has a thick shaft portion 32 a and an upper end portion 32 b. Further, the piston shaft portion 31 is literally shaped like a long rod, and at one end thereof, the piston shaft portion 31 is disposed so as to be covered by a thick shaft portion 32 a thicker than the shaft portion 31. That is, the thick shaft portion 32a has a hollow cylindrical shape, and the piston shaft portion 31 is disposed and fixed inside thereof. Moreover, the upper end part 32b which exhibits a bowl shape is being fixed to the edge part of the thick-shaft part 32a. Further, the other end of the piston shaft 31 disposed in the lower end direction D is connected to a piston 50 described later (see FIG. 3).

  The elastic portion 33 urges the piston rod portion 30 in the direction of the pressing portion 20, that is, in the upper end direction U. In the elastic portion 33, the first spring portion 33a, the first washer portion 33c, the second washer portion 33d, and the second spring portion 33b are disposed in order from the upper end portion direction U to the lower end portion direction D, In any case, the piston shaft portion 31 is inserted, and the piston shaft portion 31 is disposed so as to pass through the centers of the first spring portion 33a, the first washer portion 33c, the second washer portion 33d and the second spring portion 33b. It is done. In this case, the first spring portion 33a and the second spring portion 33b are preferably coil springs. Moreover, it is preferable that the 1st washer part 33c and the 2nd washer part 33 exhibit disk shape (refer FIG. 3).

  One end of the first spring portion 33a is in contact with the thick shaft upper end portion 32 of the piston rod portion 30, and the other end is in contact with the first washer portion 33c. In addition, the first washer portion 33c and the second washer portion 33d are disposed in contact with each other (see FIG. 3).

  Further, one end of the second spring portion 33b is in contact with the second washer portion 33d, and the other end is in contact with a recess 47 of a second case portion 46 described later. A central hole 33cc which is a circular hole is disposed at the center of the first washer 33c, and the central hole 33cc is a hole diameter through which the thick shaft portion 32a can pass. A second central hole 33dd, which is a circular hole, is disposed at the center of the second washer 33d, and the second central hole 33dd is centered so that the thick shaft portion 32a can not pass through. The hole diameter is made smaller than the hole 33 cc. Accordingly, the diameter is set to be smaller in the order of the diameter of the central hole 33cc, the diameter of the pressing portion 20, and the diameter of the second central hole 33dd. However, it is as above-mentioned that the piston axial part 31 in the piston rod part 30 has penetrated all. Further, the spring constant of the second spring portion 33b is larger than that of the first spring portion 33a.

  Further, as described above, the piston shaft portions 31 are disposed so that the first spring portion 33a, the first washer portion 33c, the second washer portion 33d, and the second spring portion 33b are inserted. Therefore, the piston rod portion 30 is urged in the upper end direction U by the first spring portion 33a, the first washer portion 33c, the second washer portion 33d and the second spring portion 33b, and the pressing portion 20 is moved to the lower end portion. It is the resistance when pushing in the direction D. For this reason, a piston portion 50 described later is also urged in the lower end direction D.

  The case unit 40 is connected to the second case unit 46. The inside of the case portion 40 has a hollow cylindrical shape, and the outer shape thereof has a substantially wedge shape for the user to grip. Accordingly, the case portion 40 has a shape that is easy for the user to grip.

  Further, the case portion 40 has a window portion 42 which is an opening portion, and the scale portion 43 is disposed inside the window portion 42. The scale unit 43 displays a three-digit number and displays the amount of movement of the above-described cylinder unit 26. The scale 43 is made of a transparent resin and has a hollow cylindrical shape, in which the numbers of three steps are displayed, the lower 43 a is about 0.1, the middle 43 b is 1, and the upper 43 c is 10. Expressing the rank. The lower portion 43a has a scale of 0.1. It is engraved 50 ticks in one revolution. The middle stage 43b rotates one scale when the lower stage 43a rotates by 10 scales, and when the middle stage 43b makes one rotation, the upper stage 43c rotates one scale. Although the scale of the upper stage 43c is described from 0 to 9, the scale of the upper stage 43c is permitted to rotate up to 6. This will be described later.

  It arrange | positions on the 2nd window part 44 and 44 as an opening part on the both sides of case part 40. As shown in FIG. Further, it is preferable that the ring fixing portion 28 be disposed at a position between the second windows 44 and 44 in the front end direction F of the case 40. That is, in the case portion 40, the portion between the second windows 44, 44 is closed, and the ring fixing portion 28 is disposed in the front end direction F thereof. Further, inside the second windows 44, 44, the rotary ring 27 fixed to the cylindrical part 26 is disposed, and the user can rotate the rotary ring 27 through the second windows 44, 44. By rotating around the axis, it is possible to increase or decrease the moving amount of the cylindrical portion 26 in the same manner as rotating the knob portion 23. The rotation ring 27 disposed in the cylinder 26 comes into contact with the second window upper end 44a of the second window 44, whereby the movement of the cylinder 26 is restricted, and the rotation ring 27 does not rotate any more. Is set as. Therefore, as described above, the amount of movement of the cylindrical portion 26 is limited so that the 10's place is 6 (see FIGS. 4a, b, c). Further, the movement of the pressing portion 20, which is axially fixed thereto, is limited, and the movement of the piston rod portion 30 and the piston portion 50 connected thereto is also limited.

  In the case portion 40, the step portion 45b serving as a step is provided inside the hollow cylindrical other end portion 45a, and the first washer portion 33c described above is connected to the second case portion 46 via the connection portion 100. It is arranged to be locked. Accordingly, the outer diameter of the first washer portion 33c is substantially the same as the inner diameter of the first washer portion 33c so that it can be disposed at the inner diameter of the step portion 45b (see FIG. 5).

  The second case portion 46 has a hollow cylindrical shape, and the above-described piston rod portion 30 is disposed movably in the lower end direction D or the upper end direction U in a cylindrical hole portion 46 a centrally disposed in the cylindrical shape. ing. Further, as described above, the other end of the second spring portion 33 b is disposed in the recess 47.

  The piston storage portion 70 functions as a so-called piston cylinder, and both have a bottomed cylindrical piston storage upper portion 71 and a piston storage lower portion 72. By having the female screw portion 71b and the male screw portion 72b in the openings 71a and 72a, respectively, these are screwed and fixed (see FIG. 6).

  Further, the packing portion 60 is disposed between the piston housing upper portion 71 and the piston housing lower portion 72, and is fixed so that the packing portion 60 is sandwiched between the piston housing upper portion 71 and the piston housing lower portion 72. There is. The packing portion 60 has an annular shape and has a hole-shaped annular inner portion 61, and the piston portion 50 is disposed slidably in the annular inner portion 61. The packing portion 60 is preferably made of flexible rubber or synthetic resin. Further, the packing portion 60 has a water tightness with the piston portion 50, and the atmosphere X including the component of the sucked liquid is unlikely to intrude into the case portion 40. The piston housing portion 70 has a pipette tip holding portion 71c which has a hollow cylindrical shape elongated in the lower end direction D, and the pipette tip 80 can be connected to the pipette tip holding portion 71c. The pipette tip holding portion 71c has a tapered shape in cross-sectional view that gradually narrows in the tip direction F, and the filter 73 is inserted into the tip portion 72. In addition, a non-slip member 74 made of rubber is provided on the outer periphery of the distal end portion 72 to ensure connection with the pipette tip 80.

  The pipette tip 80 has a tip 81 with a thin and sharp shape, and is configured to facilitate suction of a small amount of liquid. In addition, it has a tapered shape in side view gradually increasing in thickness toward the upper end direction U, and has a hollow cylindrical shape. Further, as described above, the pipette tip upper end portion 82 is open and fitted with the antislip member 74 disposed on the outer periphery of the tip end portion 72 in the above-described pipette tip holding portion 71c. The pipette tip 80 is removable, and is preferably made of a transparent synthetic resin, and can be exchanged for each chemical solution to be used (see FIG. 6).

  The pipette device 10 having such a configuration can adjust the amount of liquid to be aspirated. Here, in the case where the pressing portion 20 is positioned most in the drawing right or in the upper end direction U, the position of the piston portion 50 from the bottom portion 75 of the piston accommodating portion 70 is set as the initial position t (see FIG. 7).

  From this state, when the user presses the pressing portion 20, the piston portion 50 approaches the bottom portion 75 of the piston housing portion 70. This position is taken as a first approach position t1 (see FIG. 2). From the initial position t (see FIG. 7) to the first approach position t1, the amount of movement of the piston portion 50 in the piston housing portion 70 is the amount of liquid to be sucked. Here, even if the first approach position t1 adjusts the amount of suction, the position does not change except as described later, but the piston storage portion 70 in the piston portion 50 in the state where the pressing portion 20 is not pressed. The initial position t changes from the bottom 75 to the position of the bottom 75. The numerical value of the scale portion 43 at the initial position t when the pressing portion 20 is positioned most in the upper end direction U is 600 (see FIGS. 2 and 4c).

  As described above, when the knob portion 23 or the rotation ring portion 27 is rotated, the cylindrical portion 26 is rotated, but in the cylindrical portion 26, a female screw portion 41a is formed inside the case portion 40 described later. Since the male screw parts 26a are formed, they are screwed together, and when the shaft part 21 is rotated about the axis, the cylinder part 26 is also rotated, and the cylindrical part 26 is the tip of the shaft part 21 with respect to the shaft part 21. Move in the part direction F. Thus, by moving the thick shaft upper end portion 32 of the piston rod portion 30 in the tip end direction F, the piston portion 50 is also pressed and moved in the tip end direction F. The scale at this time gradually decreases from 600 to 0.

  At this time, as described above, since the second spring portion 33b has a larger spring constant than the first spring portion 33a, the first spring portion 33a is gradually compressed first. At the same time, the piston 50 also moves closer to the bottom 75 of the piston housing 70.

  Furthermore, when the knob portion 23 or the rotary ring portion 27 is rotated, the first spring portion 33a is gradually compressed and moves so as to approach the bottom portion 75 of the piston housing portion 70, the thick shaft upper end portion 32 becomes the first spring portion. While compressing 33a, the thick shaft portion 32a passes through the center hole 33cc of the first washer 33c and contacts the second washer 33d. This position is the zero point of the scale, and the adjustment position ts of the piston unit 50 (see FIG. 8) is the same position as the first approach position t1 (see FIG. 1).

  More specifically, the amount of suction is defined by the contraction of the extended first spring portion 33a. Therefore, the position where the first spring portion 33a is maximally contracted, that is, the position where the thick shaft portion 32a passes through the center hole 33cc of the first washer portion 33c and contacts the second washer portion 33d is the piston portion 50. The piston portion 50 also has the same adjustment position ts as the first approach position t1 for approaching the bottom portion 75 of the piston storage portion 70. Therefore, when the scale becomes 0, the adjustment position ts away from the bottom portion 75 of the piston housing 70 in the state where the pressing unit 20 is not pressed becomes the scale 0 point (see FIG. 4a and FIG. 8). Since the adjustment position ts of the piston portion 50 is the same position as the first approach position t1, the first spring portion 33a can not contract any more, and the amount by which the pipetting device 10 can suction the liquid becomes zero.

  In addition, when the knob 23 or the rotation ring 27 is reversely rotated, the piston 50 is moved in the upper end direction U. As a result, the position of the piston portion 50 is changed to a position away from the bottom portion 75 of the piston accommodating portion 70.

  Therefore, if the position of the piston portion 50 is short, the position is the position of the piston portion 50 in the state where the pressing portion 20 is not pressed if the distance from the bottom portion 75 of the piston housing portion 70 is short. From the piston part 50 in the state of pushing the part 20. The amount of movement of the piston 50 to the bottom 75 of the piston housing 70, that is, the amount of movement of the piston 50 to the first approach position t1 is the amount by which the pipetting device 10 sucks the liquid. Therefore, if the distance between the piston portion 50 and the bottom portion 75 of the piston housing portion 70 is short, the amount of suction is small, and if the distance between the piston portion 50 and the bottom portion 75 of the piston housing portion 70 is long Amount will increase. This movement amount is clear by the scale 43 of the lower stage 43a, the middle stage 43b, and the upper stage 43c, in which the three-digit number is displayed in the scale 43 described above, and between the initial position t and the adjustment position ts The piston unit 50 can be disposed at any position of the above, and the range within this range can be freely adjusted. Also, the accurate suction amount can be measured by the scale unit 43.

  At this time, the user inevitably grips the case portion 40 of the pipette device 10. In this case, when gripping the case 40 of the pipetting device 10, the rotary ring 27 may be touched if it is conventional. In this case, the previously set suction may change, and the set suction amount may not be maintained. However, since the pipetting device 10 in the present embodiment has the ring fixing portion 28, the user necessarily holds the case portion 40 of the pipetting device 10 and simultaneously presses the ring fixing portion 28. Therefore, the rotation of the rotary ring portion 27 can be prevented. In particular, by arranging the ring fixing portion 28 in the front end direction F of the case portion 40 of the pipette device 10 in the present embodiment, if the user grips the case portion 40, the finger naturally functions as the ring fixing portion Since 28 is pressed, the rotation of the rotary ring portion 27 can be blocked.

  In the pipetting device 10, when working in suctioning liquid, the user adjusts the suction amount as described above, and then presses the pressing portion 20 while pressing the ring fixing portion 28, and the piston portion 50 The position to the bottom portion 75 of the storage unit 70, that is, from an arbitrary initial position t to the first approach position t1. Thereafter, the user releases his / her hand from the pressing unit 20, and during the series of operations that the pressing unit 20 sucks the liquid medicine as the elastic unit 33 restores in the upper end direction U, ie, the user However, since the ring fixing portion 28 is pressed while holding the case portion 40, it is possible to prevent the fluctuation of the suction amount of the liquid set in advance as much as possible.

  As described above, while holding the case portion 40, the user almost inevitably presses the ring fixing portion 28, so that the rotation of the rotary ring portion 27 is prevented. In this state, when the user presses the pressing portion 20 of the pipetting device 10, the piston portion 50 moves toward the bottom portion 75 of the piston housing portion 70 through the piston rod portion 30 (see FIG. 2). Moving to the first approach position t1 approaching 75 is as described above, but in this state, the liquid is dipped in the pipet tip 80 and the user releases the thumb from the pressing portion 20 while holding the case portion 40. Then, the pressing portion 20 is returned by the elastic portion 33 in the upper end portion direction U. Accordingly, the liquid is aspirated from the pipette tip 80 at the same time as the piston portion 50 moves in the direction away from the bottom portion 75 of the piston housing portion 70, that is, in the upper end direction U (see FIG. 7).

  Even in this case, since the user holds the case 40, the ring fixing portion 28 is almost necessarily pressed. Accordingly, the rotation of the rotation ring 27 is blocked. In this state, when the user presses the pressing portion 20 of the pipette device 10, the piston portion 50 moves toward the bottom portion 75 of the piston housing portion 70 through the piston rod portion 30, and approaches the bottom portion 75. By disposing the piston unit 50 at the 1 approach position t1, the suctioned liquid can be discharged. This allows the pipetting device 10 to aspirate and dispense the correct amount of liquid.

  In this case, when the user inadvertently touches the rotary ring 27 disposed through the second windows 44, 44, the rotary ring 27 disposed inside the second windows 44, 44. However, since the ring fixing portion 28 is pressed, the rotation ring portion 27 does not rotate, and the suction amount does not change. Therefore, when the user presses the ring fixing portion 28, it is possible to prevent the change of the suction amount once set.

  Depending on the viscosity of the liquid, the sucked liquid may not be completely discharged. At that time, the user further pushes the pressing unit 20 in the pipetting device 10. Thereby, from the position where the first spring portion 33a is contracted to the maximum, that is, the thick shaft portion 32a passes from the center hole 33cc of the first washer 33c and contacts the second washer 33d. Press the second washer 33d. As a result, the second spring portion 33 b having a spring constant larger than that of the first spring portion 33 a is further contracted, and the piston portion 50 is in contact with the bottom portion 75 of the piston housing portion 70. Thereby, the suctioned liquid can be completely discharged from the piston housing portion 70 (not shown).

DESCRIPTION OF SYMBOLS 10 Pipetting device 20 Pressing portion 27 Rotating ring portion 28 Ring fixing portion 28 pressed ring fixing portion 30 Piston rod portion 33 Elastic portion 40 Case portion 43 Scale portion 49 Vent hole 49a Second vent hole 50 Piston portion 60 Packing portion 61 Annular inside 70 Piston housing 71 Piston housing upper part 72 Piston housing lower part 71 c Pipette tip holder 80 Pipette tip t Initial position t1 First approach position ts Adjustment position

Claims (3)

A rotating ring that rotates to adjust the amount by which the user aspirates and discharges liquid;
A case portion for housing the rotating ring portion therein;
And a ring fixing portion disposed in the case portion for blocking rotation of the rotating ring portion.
The pipette device according to claim 1, wherein the user presses the ring fixing portion by holding the case portion, and the ring fixing portion contacts the rotation ring portion to block the rotation of the rotation ring portion. The pipette device according to claim 1, wherein the ring fixing portion is elastically connected to the case portion. The pipette device according to claim 1 or 2, wherein the ring fixing portion is disposed in the direction of the front end of the case portion.

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